TY  - JOUR
AU  - V. V. Filippov
TI  - Sequences of changes of variables and the Li\'enard equation
JO  - Differencialʹnye uravneniâ
PY  - 1994
SP  - 1148
EP  - 1155
VL  - 30
IS  - 7
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1994_30_7_a6/
LA  - ru
ID  - DE_1994_30_7_a6
ER  -