TY  - JOUR
AU  - V. V. Amel'kin
AU  - N. A. Lukashevich
TI  - The periods of the solutions of certain autonomous systems
JO  - Differencialʹnye uravneniâ
PY  - 1970
SP  - 2115
EP  - 2120
VL  - 6
IS  - 12
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1970_6_12_a0/
LA  - ru
ID  - DE_1970_6_12_a0
ER  -