TY  - JOUR
AU  - I. I. Pleshkan
TI  - A new method of research on the isochronism of a system of two differential equations
JO  - Differencialʹnye uravneniâ
PY  - 1969
SP  - 1083
EP  - 1090
VL  - 5
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1969_5_6_a10/
LA  - ru
ID  - DE_1969_5_6_a10
ER  -