Geodesic
Generalization of the Boundary Function Method for Solving Boundary-Value Problems for Bisingularly Perturbed Second-Order Differential Equations
Matematičeskie zametki, Tome 94 (2013) no. 4, pp. 483-487.

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A bisingular boundary-value problem for an ordinary differential equation is considered. The asymptotics of the solution as the sum of an outer expansion and an analog of a number of functions of the boundary layer is constructed.
Keywords: bisingularly perturbed differential equation, boundary-value problem, boundary function method, maximum principle. 
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K. Alymkulov; T. D. Asylbekov; S. F. Dolbeeva. Generalization of the Boundary Function Method for Solving Boundary-Value Problems for Bisingularly Perturbed Second-Order Differential Equations. Matematičeskie zametki, Tome 94 (2013) no. 4, pp. 483-487. http://geodesic.mathdoc.fr/item/MZM_2013_94_4_a0/

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