TY  - JOUR
AU  - V. N. Laptinskii
TI  - On the question of the construction of periodic solutions of nonautonomous differential equations
JO  - Differencialʹnye uravneniâ
PY  - 1983
SP  - 1335
EP  - 1343
VL  - 19
IS  - 8
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1983_19_8_a5/
LA  - ru
ID  - DE_1983_19_8_a5
ER  -