TY  - JOUR
AU  - V. S. Ermolin
TI  - The existence of a definitely positive first integral
JO  - Differencialʹnye uravneniâ
PY  - 1976
SP  - 1123
EP  - 1124
VL  - 12
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1976_12_6_a18/
LA  - ru
ID  - DE_1976_12_6_a18
ER  -