TY  - JOUR
AU  - A. E. Gel'man
TI  - A method of finding periodic solutions of autonomous systems of differential equations
JO  - Differencialʹnye uravneniâ
PY  - 1977
SP  - 949
EP  - 950
VL  - 13
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1977_13_5_a18/
LA  - ru
ID  - DE_1977_13_5_a18
ER  -