TY  - JOUR
AU  - O. I. Nikitin
AU  - A. I. Perov
TI  - On the question of approximate determination of periodic solutions of differential equations
JO  - Differencialʹnye uravneniâ
PY  - 1983
SP  - 2001
EP  - 2004
VL  - 19
IS  - 11
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1983_19_11_a27/
LA  - ru
ID  - DE_1983_19_11_a27
ER  -