TY  - JOUR
AU  - V. A. Lunkevich
TI  - The problem of the center for differential equations with discontinuous right-hand sides
JO  - Differencialʹnye uravneniâ
PY  - 1968
SP  - 1625
EP  - 1639
VL  - 4
IS  - 9
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1968_4_9_a7/
LA  - ru
ID  - DE_1968_4_9_a7
ER  -