TY  - JOUR
AU  - K. S. Sibirskii
TI  - On the number of limit cycles in the neighborhood of a singular point
JO  - Differencialʹnye uravneniâ
PY  - 1965
SP  - 53
EP  - 66
VL  - 1
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1965_1_1_a6/
LA  - ru
ID  - DE_1965_1_1_a6
ER  -