TY  - JOUR
AU  - M. Yu. Bogdanova
AU  - N. F. Naumovich
TI  - Differential equations with an area first integral
JO  - Differencialʹnye uravneniâ
PY  - 1983
SP  - 1613
EP  - 1617
VL  - 19
IS  - 9
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1983_19_9_a18/
LA  - ru
ID  - DE_1983_19_9_a18
ER  -