TY  - JOUR
AU  - G. E. Popov
TI  - A certain class of integrable equations with limit cycles
JO  - Differencialʹnye uravneniâ
PY  - 1972
SP  - 1898
EP  - 1900
VL  - 8
IS  - 10
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1972_8_10_a25/
LA  - ru
ID  - DE_1972_8_10_a25
ER  -