TY  - JOUR
AU  - L. A. Cherkas
AU  - G. M. Buldyk
TI  - Integral curves of a certain class of differential equations that have a center
JO  - Differencialʹnye uravneniâ
PY  - 1976
SP  - 2102
EP  - 2104
VL  - 12
IS  - 11
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1976_12_11_a26/
LA  - ru
ID  - DE_1976_12_11_a26
ER  -