TY  - JOUR
AU  - G. S. Rychkov
TI  - A Criterion for the Existence of Several Limit Cycles of the Abel Equation of the Second Kind
JO  - Differencialʹnye uravneniâ
PY  - 2003
SP  - 1058
EP  - 1061
VL  - 39
IS  - 8
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_2003_39_8_a6/
LA  - ru
ID  - DE_2003_39_8_a6
ER  -