TY  - JOUR
AU  - V. V. Amel'kin
TI  - Classification of limit cycles
JO  - Differencialʹnye uravneniâ
PY  - 1991
SP  - 1291
EP  - 1296
VL  - 27
IS  - 8
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1991_27_8_a0/
LA  - ru
ID  - DE_1991_27_8_a0
ER  -