TY  - JOUR
AU  - I. I. Pleshkan
TI  - On the problem of isochronism for systems with discontinuous right-hand sides
JO  - Differencialʹnye uravneniâ
PY  - 1974
SP  - 647
EP  - 658
VL  - 10
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1974_10_4_a9/
LA  - ru
ID  - DE_1974_10_4_a9
ER  -