TY  - JOUR
AU  - V. V. Filippov
TI  - On an investigation of ordinary differential equations ``with respect to the first approximation''
JO  - Differencialʹnye uravneniâ
PY  - 1992
SP  - 1351
EP  - 1355
VL  - 28
IS  - 8
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1992_28_8_a7/
LA  - ru
ID  - DE_1992_28_8_a7
ER  -