TY  - JOUR
AU  - V. A. Baikov
TI  - Approximate symmetries of an equation of van der Pol type
JO  - Differencialʹnye uravneniâ
PY  - 1994
SP  - 1820
EP  - 1822
VL  - 30
IS  - 10
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1994_30_10_a20/
LA  - ru
ID  - DE_1994_30_10_a20
ER  -