TY  - JOUR
AU  - A. Turaev
TI  - Some criteria for the existence of limit cycles of a~differential equation
JO  - Izvestiâ vysših učebnyh zavedenij. Matematika
PY  - 1970
SP  - 92
EP  - 95
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IVM_1970_5_a14/
LA  - ru
ID  - IVM_1970_5_a14
ER  -