Geodesic

Sommaire du Fascicule no. 1

Some boundary value problems for a certain class of singular partial differential equations
p. 3-14
A certain inverse problem for linear symmetric $t$-hyperbolicsystems with $n+1$ independent variables
p. 15-23
A mixed problem for a certain class of second order hyperbolic-parabolic equations
p. 24-31
Remarks on some transformations of systems of equations of Čaplygin type
p. 32-35
Boundary value problems for equations of the type of Humbert's equation
p. 36-40
A certain analogue of Poisson's formula
p. 41-45
Some problems of the type of the Cauchy problem and problems with a shift for a certain degenerate hyperbolic equation
p. 46-58
Analyticity of the solutions of nonlinear transmission problems
p. 59-68
A priori estimates of generalized solutions of degenerate quasilinear elliptic equations
p. 69-78
A certain boundary value problem with shift for the equation $\operatorname{sign}y|y|^mu_{xx}+y_{yy}=0$
p. 79-88
On a priori estimates for the Tricomi and the Dirichlet problem for a certain equation with degeneracy of the type and of the order
p. 89-96
Smoothness of the solution of a certain boundary value problem for an equation of mixed type with two parallel lines of degeneracy
p. 97-102
The Darboux problem for a certain degenerate second order loaded integrodifferential equation
p. 103-108
On the inverse problem for a simple layer potential
p. 109-117
Connected operators and boundary value problems for equations of elliptic type
p. 118-128
The integral representability of the resolvent of a selfadjoint elliptic operator
p. 129-136
The Dirichlet problem for a certain equation of mixed type
p. 137-143
Determination of the density of a body from a prescribed potential
p. 144-147
Potentials for higher order elliptic equations, and inverse problems
p. 148-158
Global methods of studying the oblique derivative problem for elliptic equations
p. 159-171
The inverse problem of determining a body for the transport equation
p. 172-174
The determination of a coefficient in the lowest order term of a general parabolic equation
p. 175-176
A certain boundary value problem for a loaded heat equation
p. 177-179
On the question of the composition of singular integrals
p. 180-182
Letter to the editors: “Functionally invariant solutions of second order quasilinear partial differential equations” (Differencial'nye Uravnenija 11 (1975), 533–540)
Letter to the editors: “Difference schemes of the sixth order of accuracy for a Poisson equation of an arbitrary number of dimensions” (Differencial'nye Uravnenija 11 (1975), no. 5, 934–936)

Sommaire du Fascicule no. 2

A quasilinearization method for the construction of an approximate solution of a certain boundary value problem for ordinary differential equations
p. 195-199
The limit cycles of a certain differential equation
p. 200-205
Dynamical systems with invariant Lebesgue measure on connected, closed and orientable surfaces
p. 206-212
The escape of a certain nonlinear object from several more inert pursuers
p. 213-226
The resolvent and fractional powers of ordinary differential operators in spaces of smooth functions
p. 227-233
A theorem on critical cases of systems of difference equations
p. 234-240
The complete qualitative investigation of Duffing's equation
p. 241-255
Symbolic dynamics that are generated by homoclinic structures
p. 256-262
The problem of discrimination for the normal domain $N_4$ in the space $R^3$
p. 263-271
Higher order singularly degenerate differential operators with unbounded operator coefficients
p. 272-280
Algebraic invariants of multidimensional differential systems
p. 281-291
Conditions for a center for a certain Liénard equation
p. 292-298
The singular nonlinear boundary value problem for a second-order equation with a rapidly growing right-hand side
p. 299-304
A mixed problem for a hyperbolic system in space
p. 305-308
Characteristic problems with a principal part that contains mixed derivatives
p. 309-324
Asymptotic behavior with respect to time for the solutions of a strongly parabolic system with discontinuous coefficients
p. 325-330
The Cauchy problem for certain abstract hyperbolic equations of evenorder
p. 331-342
The normal solvability of the Dirichlet problem for a certain degenerate elliptic system
p. 343-347
A geometric method of solving systems of differential equations
p. 348-351
The asymptotic behavior of the solutions of a certain system of differential equations in the neighborhood of a singular point
p. 352-353
Stability of a trajectory
p. 354-355
Eigenvalues of a periodic boundary value problem for certain partial differential equations
p. 356-358
The approximability property of regular systems of linear differential equations
p. 359-361
The solvability of operator-differential equations of arbitrary order
p. 362-364
The approximate representation of relaxation oscillations
p. 365-368
A method of solving Abel and Riccati equations
p. 369-371
A priori estimates and nonlocal existence theorems for the solutions of quasilinear parabolic equations in $L_p$ spaces
p. 372-374
IV Всесоюзная конференция по теории и приложениям дифференциальных уравнений
p. 375-376

Sommaire du Fascicule no. 3

Theory of moving singular points of second order equations. I
p. 387-416
A certain class of functional-differential equations
p. 417-427
Asymptotic behavior of the spectrum of a Sturm–Liouville operator in the case of a limit circle
p. 428-437
Dynamical systems with invariant Lebesgue measure on the surface of a torus
p. 438-445
$l$-evasion in linear differential games
p. 446-455
On the theory of linear inhomogeneous systems of differential equations with constant coefficients
p. 456-460
The approximate solution of a certain boundary value problem
p. 461-474
An estimate of the jump in the highest exponent of a linear system under exponential perturbations
p. 475-483
Controllability in multi-valued processes
p. 484-493
A mixed problem for certain parabolic-hyperbolic equations
p. 494-501
Certain inverse problems for degenerate hyperbolic equations
p. 502-510
Existence of a generalized solution of the Tricomi problem. I
p. 511-528
Integral estimates of the fractional derivatives of the solutions of linear equations of elliptic type in the $L_2$ metric. II
p. 529-539
A certain difference approximation of the Poisson equation
p. 540-548
Membership in the class $W_2^1$ of the classical solution of the Dirichlet problem for an elliptic equation in an arbitrary unbounded domain
p. 549-551
A study of the solutions of the Cauchy problem for semi-explicit differential equations with retarded argument
p. 552-554
Boundary value problems on finite and infinite intervals
p. 555-557
Solvability of a boundary value problem for a certain class of nonlinear ordinary differential equations
p. 558-560
On the question of the nonuniqueness of solutions of a first order differential equation
A boundary value problem for differential equations with deviating argument
p. 562-566
Petr Ivanovič Kuznecov (on the fortieth anniversary of his scientific activity)
p. 567-570

Sommaire du Fascicule no. 4

Основные направления развития народного хозяйства СССР на 1976–1980 годы
Theory of moving singular points of second order equations. II
p. 579-598
Optimal controls in coefficient problems for univalent functions
p. 599-611
A problem of control from incomplete data
p. 612-620
The zeros of the oscillatory solutions of the equation $(p(t)x')'+f(t,$ $x,$ $x')=0$
p. 621-625
Optimal processes in the case of weakly differentiable connections. I
p. 626-636
Singular solutions in problems of maximum optimization of dynamical systems with a quadratic quality criterion
p. 637-644
On the question of the existence and uniqueness of the solution of ordinary differential equations
p. 645-652
A criterion for $\varepsilon $-controllability of a linear system
p. 653-657
A convergent iteration method for constructing solutions to systems in standard form
p. 658-667
A mathematical treatment of a certain problem of a longitudinal shock along a relaxing rod
p. 668-685
The branching of the solutions of mixed problems for almost linear hyperbolic systems of the plane
p. 686-699
Existence of a generalized solution of the Tricomi problem. II
p. 700-719
A regional-structural method
p. 720-728
Apriori-Abschätzungen der Lösungen von Randwertproblemen für einige Differentialoperatorgleichungen
p. 729-739
The solutions of Painlevé's fifth equation
p. 740-742
On the question of the asymptotic properties of the renewal equation
p. 743-746
A criterion for the nonoscillation of a linear difference equation
p. 747-750
Necessary and sufficient conditions for the disconjugacy of the solutions of a second order linear equation
p. 751-753
On conditions for the monocyclicity of a certain system of differential equations
p. 754-757
A certain variant of an identity of Picone type, and Sturm's theorems for higher order ordinary differential equations
p. 758-759
A certain class of linear integral operators
p. 760-762
On the Tricomi problem for a second order linear equation of mixed type
p. 763-765
On the question of stability with respect to the first approximation
p. 766-769

Sommaire du Fascicule no. 5

The Riemann problem. II
p. 779-799
The observability of nonstationary systems with lag
p. 800-805
The spectrum of a Schrödinger equation with a complex pseudoperiodic potential. I
p. 806-814
Boundary value problems for equations with formally symmetric differential-difference operators
p. 815-824
The bounded solutions of first order operator-differential equations
p. 825-839
Absolute asymptotic stability of linear differential equations with infinitely many lags in a Banach space
p. 840-847
Maximin deviation in a differential game
p. 848-856
The approximation, by the method of V. K. Dzjadyk, of solutions of problems for equations of hyperbolic type
p. 857-864
Certain problems that are connected with the theory of longitudinal shock along rods
p. 865-880
Hyperbolic equations with variable operator-valued coefficients
p. 881-891
The study of difference schemes for quasilinear degenerate elliptic equations
p. 892-901
A mixed problem for a first order hyperbolic system with a small parameter multiplying the derivatives
p. 902-907
Inclusions of Hammerstein type
p. 908-915
A system of integral equations in a space of generalized functions
p. 916-921
Conditions for the existence and uniqueness of a limit cycle for a certain two-dimensional differential system
p. 922-924
Solvability, and the convergence of the Galerkin method for the equations of flexible plates and shells in the case of a one-dimensional problem
p. 925-927
A differential equation that has solutions with algebraic movable singular points
p. 928-930
A boundary value problem with a discontinuous boundary condition
p. 931-933
Some topological properties of linear inhomogeneous systems
p. 934-936
Functionally invariant solutions and the nonuniqueness of the solution of the Darboux problem for degenerate hyperbolic equations
p. 937-939
On necessary conditions for the optimality of the controls in hybrid systems
p. 940-943
The number of limit cycles of a certain second order autonumous system
p. 944-946
Andreǐ Vasil'evič Bicadze (on the occasion of his sixtieth birthday)
p. 947-954

Sommaire du Fascicule no. 6

A three-point boundary vlaue problem for a nonlinear third order ordinary differential equation
p. 963-970
On the question of the properties of the set of solutions of differential inclusions
p. 971-977
The minimal Green's matrix of a multi-valued differential operator
p. 978-982
Integrals of fractional order, and singular boundary value problems
p. 983-990
A certain limit boundary value problem that does not satisfy S. N. Bernšteǐn's condition and has an application in the theory of capillary phenomena
p. 991-998
The regularisation of controls in an approach-evasion differential-difference game
p. 999-1006
The linear problem on the optimal control of periodic solutions
p. 1007-1011
An adiabatic invariant of a system of linear oscillators, and scattering theory
p. 1012-1018
Periodic and almost periodic solutions of singularly perturbed differential equations of neutral type
p. 1019-1027
An estimate of the eigenvalue that is smallest in absolute value for a certain periodic problem
p. 1028-1039
The spectrum of nonselfadjoint elliptic systems of arbitrary order
p. 1040-1051
Difference schemes for quasilinear elliptic equations in polar coordinates
p. 1052-1060
Weak solutions of the system of equations of reactor kinetics
p. 1061-1072
On imbedding theorems for a certain class of singular differential operators in a half-space
p. 1073-1083
Weight spaces of functions defined in a half-space
p. 1084-1098
A generalized Dirichlet problem for a certain class of elliptic differential operators that are degenerate on the boundary of the domain. Some spectral properties
p. 1099-1111
The Dirichlet problem for linear quasielliptic differential operators with unbounded lowest coefficients
p. 1112-1120
The integrals of the motion of nonlinear equations of Schrödinger type
p. 1121-1122
The existence of a definitely positive first integral
p. 1123-1124
Linear integral equations of the first kind in spaces of the type $H_s(R^n)$
p. 1125-1128
The dependence of the solutions of certain variational inequalities on the parameters
p. 1129-1130
On the question of the properties of the Cauchy matrix of a functional-differential equation
p. 1131-1133
Boris Pavlovič Demidovič (on the occasion of his seventieth birthday)
p. 1134-1138

Sommaire du Fascicule no. 7

Periodic solutions of certain second order equations
p. 1147-1150
The domain of definition of a Sturm–Liouville operator
p. 1151-1160
The singular solutions of nonlinear differential equations. II
p. 1161-1173
Asymptotic solutions of certain linear inhomogeneous second order differential equations in a Banach space with a small parameter multiplying the highest derivative
p. 1174-1186
The oscillation and the disconjugacy of the solutions of nonlinear differential systems
p. 1187-1193
On the question of the representation of the solutions of linear functional-differential equations
p. 1194-1203
Relatively ideally observable systems
p. 1204-1210
Necessary optimality conditions for certain classes of discrete control systems
p. 1211-1218
Construction of the equations of a system of programmed motions in a sliding state
p. 1219-1222
Monotone differential equations. II
p. 1223-1237
The problem of distinguishing the center and a focus for systems with nonzero linear part
p. 1238-1246
Comparison of equivalences of dynamical systems on the plane
p. 1247-1255
The spectral function of certain singular differential operators. I
p. 1256-1266
The first boundary value problem for degenerate elliptic equations in a half-space
p. 1267-1281
Construction of a potential with quasiregular kernel in closed form
p. 1282-1289
Solution of one-dimensional mixed problems for a certain parabolic system in a domain with variable boundary
p. 1290-1296
On the averaging method in Hilbert space for integrodifferential equations
p. 1297-1300
A remark on the number of Ljapunov constants for conditions for a center of a certain differential equation
p. 1301-1302
Algebraic and algebraic-logarithmic moving singularities of systems of second order differential equations
p. 1303-1305
The behavior of the trajectories of a certain dynamical system in the Poincaré disc
p. 1306-1309
Reduction of a controllability problem to a boundary value problem
p. 1310-1312
The stabilization of nonlinear control systems
p. 1313-1315
A method of reducing a special boundary value problem to a Cauchy problem
p. 1316-1319
Regularity classes for second order vectorial equations
p. 1320-1322
The optimality of regularizing algorithms in the solution of ill-posed problems
p. 1323-1326
Nikolaǐ Evgrafovič Kočin (on the occasion of the 75th anniversary of his birth)
p. 1327-1331
Medžid Ljatifovič Rasulov (on the occasion of his sixtieth birthday)
p. 1332-1337

Sommaire du Fascicule no. 8

Theory of the global properties of second order linear ordinary differential equations
p. 1347-1383
Necessary optimality conditions for minimax optimization problems
p. 1384-1391
Some cases of local generation of limit cycles in three-dimensional space
p. 1392-1403
The existence and uniqueness of the solutions of differential equations with lag in a Banach space
p. 1404-1409
The conditional stability of an invariant torus of a dynamical system
p. 1410-1416
The spectrum of a Schrödinger equation with a complex pseudoperiodic potential. II
p. 1417-1426
The asymptotic behavior of the solutions of systems of linear differential equations in expanding domains
p. 1427-1433
Minimax filtering under quadratic constraints. I
p. 1434-1446
The behavior of the solutions of a system of differential equations with lag near an integral manifold
p. 1447-1453
The construction of a Ljapunov function for self-regulation systems
p. 1454-1461
The problem of conjugation for systems of ordinary differential equations
p. 1462-1469
Difference schemes for parabolic equations with a nonlinear degeneracy. I
p. 1470-1484
Diffraction problems with a noncylindrical boundary of discontinuity
p. 1485-1494
The smoothness of the solutions of certain equations of parabolic type. I
p. 1495-1506
Conditions for evasion in linear differential games
p. 1507-1509
Representation of the solutions of a system of second order differential equations in the neighborhood of transcendental movable singular points
p. 1510-1511
Estimation of the error of the method of averaging functional corrections for linear equations
p. 1512-1515
Über die Vollständigkeit des Systems der verallgemeinerten Eigenfunktionen der Mehrgruppen-Diffusionsapproximation der Gleichung des Neutronentransports
p. 1516-1519
Extinguishing the rotation of a rigid body
p. 1520-1522

Sommaire du Fascicule no. 9

Theory of Weyl circles in the case of a nonselfadjoint system of second order differential equations
p. 1531-1540
Linear time-optimality problems with mixed constraints
p. 1541-1551
Limit points of the solutions of completely integrable autonomous Pfaffian systems in the neighborhood of a stationary point
p. 1552-1556
Behavior of the integral curves of a certain dynamical system
p. 1557-1567
Minimax filtering under quadratic constraints. II
p. 1568-1579
A transformation of an asymptotic expansion of the period
p. 1580-1586
Stability criteria for systems with transformed argument that are based on the symmetrization of matrices
p. 1587-1595
Linear ordinary differential equations with singularities in the class of analytic functions
p. 1596-1604
The spectral function of certain singular differential operators. II
p. 1605-1618
The smoothness of the solutions of certain equations of parabolic type. II
p. 1619-1624
Asymptotic behavior of the solution of a certain elliptic equation with discontinuous boundary conditions
p. 1625-1637
The Cauchy problem for a linear differential equation with a parameter
p. 1638-1644
Boundary value problems for differential equations with operator coefficients that depend on a parameter. I. A priori estimates
p. 1645-1661
A Runge–Kutta method for the solution of two-dimensional nonlinear Volterra integral equations
p. 1662-1668
Asymptotic properties of the solutions of equations with after effect
p. 1669-1682
Über eine Methode zur Konstruktion von Algorithmen zur Näherungsloesung linearer Integralgleichungen Volterraschen Typs.
p. 1683-1692
Rothe's method of approximate solution of the Cauchy problem for differential equations in a Banach space with a variable unbounded operator
p. 1693-1704
A two-sided numerical method of solving the boundary value problem $y^{'''}=f(t,y)$, $y(a_i)=c_i$ ($i=1,2,3$)
p. 1705-1711
Difference schemes for nonlinear Stefan problems
p. 1712-1714
A study of the stability of linear periodic differential systems by the method of variation of a parameter
p. 1715-1718
Representation of the solutions of a certain class of third order differential equations
p. 1719-1722

Sommaire du Fascicule no. 10

Andreǐ Nikolaevič Tihonov (on the occasion of his seventieth birthday)
p. 1731-1735
A problem in the theory of singular perturbations
p. 1736-1747
Singularly perturbed systems that contain an indeterminacy in the degeneracy
p. 1748-1757
Asymptotic behavior of the solution of a certain nonlinear problem with a singular boundary condition
p. 1758-1769
A method for studying the periodic solutions of systems of difference and differential-difference equations with small lag
p. 1770-1780
The solvability of boundary value problems for higher order parabolic equations in domains with curvilinear lateral boundaries
p. 1781-1792
A singularly perturbed equation of elliptic type with two small parameters
p. 1793-1803
The uniqueness of the classical (in the sense of V. A. Il'in) solution of the mixed problem for a hyperbolic equation with time-dependent coefficients
p. 1804-1814
The regularity of boundary points for the solution of a quasilinear elliptic equation that is degenerate on the boundary of the domain
p. 1815-1823
The absolute and uniform convergence of Fourier series in the eigenfunctions of the operator of elasticity theory in an entire closed domain, and a substantiation of Fourier's method
p. 1824-1831
The $m$-fold completeness of the system of generalized eigen- and associated functions of a nonselfadjoint elliptic operator, and the membership of the classical eigen- and associated functions of the operator in the class $W_2^1$
p. 1832-1841
Theorems on the $m$-fold completeness of the generalized eigen- and associated functions from $W_2^1$ of certain boundary value problems for elliptic equations and systems
p. 1842-1851
The asymptotic expansion of the solution of a second order elliptic equation with a small parameter multiplying the highest derivatives
p. 1852-1865
The unique solvability of the mixed problem for a hyperbolic equation with complex potential
p. 1866-1876
The Dirichlet problem for a second order elliptic equation
p. 1877-1891
Generalized kernels of fractional order
p. 1892-1902
A certain method of investigating the solutions of difference equations of oscillation type in the case of a small step
p. 1903-1905
The exactness of the scheme of variable directions for the heat equation in an arbitrary domain
p. 1906-1914

Sommaire du Fascicule no. 11

Nonlinear functional-differential equations
p. 1923-1932
Asymptotic behavior of the bounded solutions of systems of nonlinear second order differential equations
p. 1933-1938
The application of certain methods of the theory of ordinary differential equations to the study of difference schemes in the problem of nonlinear oscillations of a circular plate
p. 1939-1945
The canonical integral in the neighborhood of a focus
p. 1946-1953
The minimal exponent of a two-dimensional diagonal system
p. 1954-1966
Solution of a boundary value problem on the half line by the nonstationary method
p. 1967-1970
Some properties of the solutions of nonlinear differential inequalities and equations with retarded argument
p. 1971-1984
Conditions for the conservation of asymptotic stability in the case of a double zero root with a nonprime elementary divisor
p. 1985-1993
Normal forms of completely integrable systems
p. 1994-1999
The behavior of the solutions of Levinson's equation
p. 2000-2008
The stability of the unperturbed motion in the critical case of two zero roots and a pair of pure imaginary roots
p. 2009-2013
Application of the difference method to boundary value problems for abstract elliptic equations
p. 2014-2018
On the question of the stability of the solutions of infinite systems of differential equations
p. 2019-2026
Systems of elements of a space over a space, and the problem of realizing a given trajectory of motion
p. 2027-2038
Asymptotic equivalence of linear differential systems with retarded argument
p. 2039-2043
The conformal mapping of the half-plane onto circular pentagons with a cut
p. 2044-2051
The characteristic Cauchy problem for a quasilinear analytic system
p. 2052-2063
The membership in the class $W_2^1$ of the classical solution of the Dirichlet problem for an elliptic equation in an arbitrary (bounded or unbounded) domain
p. 2064-2067
A solution of the problem of the excitation of two circular cylinders by an electrical dipole of arbitrary orientation
p. 2068-2075
Periodic solutions of certain nonlinear partial differential equations
p. 2076-2084
Über die divergente Darstellung der Bilinearformen einer Klasse von Differentialoperatoren
p. 2085-2088
Selfadjointness of elliptic second order differential operators
p. 2089-2091
A test for the asymptotic stability of differential systems with $g$-perturbations
p. 2092-2094
A generalization of the Brockett-Lee theorem
p. 2095-2096
The smoothness of the solutions of certain equations of parabolic type. III
p. 2097-2100
The orientation of an inert rigid body
Integral curves of a certain class of differential equations that have a center
p. 2102-2104
Letter to the editors: “Difference schemes for parabolic equations with a nonlinear degeneracy” (Differencial'nye Uravnenija 12 (1976), no. 8, 1470-1484)
Letter to the editors: “The existence of statistical solutions of a system of Vlasov equations” (Differencial'nye Uravnenija 11 (1975), no. 7, 1256–1268)

Sommaire du Fascicule no. 12

Characteristic vectors and sets of functions of two variables and their fundamental properties
p. 2115-2128
Sufficient conditions for a strong minimum for degenerate optimal control problems
p. 2129-2138
Certain boundary value problems for a system of ordinary differential equations
p. 2139-2148
Minimax filtering in the case of quadratic constraints. III
p. 2149-2158
Topological invariants of complex linear flows
p. 2159-2169
A certain generalization of the hypergeometric equation
p. 2170-2174
The existence of a mean value for a certain class of differential games that may be described by the wave equation
p. 2175-2187
A formula for the entropy of smooth dynamical systems
p. 2188-2192
The local dynamical equivalence of differential equations
p. 2193-2200
The dependence of the parameters of a dynamical system on the coefficients of a point transformation
p. 2201-2213
Local controllability
p. 2214-2222
The solvability of the first mixed problem of the dynamics of a three-dimensional elastic body
p. 2223-2232
A method for the approximation of regularized solutions for nonlinear equations of the first kind with an inexact operator
p. 2233-2241
The Cauchy problem for second order hyperbolic operator differential equations
p. 2242-2250
Integral representations and boundary value problems for certain elliptic type equations with a singular hyperplane
p. 2251-2264
A uniqueness theorem for the solution of the inverse problem for a quasilinear hyperbolic equation
p. 2265-2266
Steuerbarkeit von Systemen mit Retardierung nach der Anfangsfunktion
p. 2267-2268
Einige notwendige und einige hinreichende Bedingungen der Hurwitzschen Eigenschaft von Polynomen
p. 2269-2270
Zweiseitige Methoden Runge–Kuttaschen Typs zur numerischen Lösung des Cauchyproblems für gewöhnliche Differentialgleichungen
p. 2271-2272
On the problem of distinguishing the center and focus for systems of nonlinear oscillations
p. 2273-2274
On the optimality of singular controls in systems with after-effect
p. 2275-2278
Estimation of the exponential growth of the solutions of certain linear partial differential equations with a highest order term
p. 2279-2280
Absence of cycles in the equation $y'=Q_2(x,y)/P_2(x,y)$, with a focus of third degree of structural instability
p. 2281-2282
Über ein Problem Stefanschen Typs mit Verschwinden einer der Phasen
p. 2283-2284
Occurrence of an internal boundary layer in singularly perturbed systems of conditionally stable type
p. 2285-2286
Letter to the editors: “Uniqueness and convergence of successive approximations for a certain class of Volterra equations” (Differencial'nye Uravnenija 10 (1974), 1721–1724)