TY  - JOUR
AU  - B. M. Arkhipov
TI  - A nonlinear periodic boundary value problem for an equation and a system of equations of the second order
JO  - Differencialʹnye uravneniâ
PY  - 1969
SP  - 456
EP  - 462
VL  - 5
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1969_5_3_a4/
LA  - ru
ID  - DE_1969_5_3_a4
ER  -