TY  - JOUR
AU  - V. V. Filippov
TI  - Remarks on Guiding Functions and Periodic Solutions
JO  - Differencialʹnye uravneniâ
PY  - 2001
SP  - 458
EP  - 469
VL  - 37
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_2001_37_4_a4/
LA  - ru
ID  - DE_2001_37_4_a4
ER  -