TY  - JOUR
AU  - N. N. Vinogradov
TI  - Some existence theorems for a periodic solution of an autonomous system of six differential equations
JO  - Differencialʹnye uravneniâ
PY  - 1965
SP  - 330
EP  - 334
VL  - 1
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1965_1_3_a6/
LA  - ru
ID  - DE_1965_1_3_a6
ER  -