TY  - JOUR
AU  - V. M. Lebedeva
TI  - The number of periodic solutions of a first order equation with rational right hand side
JO  - Differencialʹnye uravneniâ
PY  - 1969
SP  - 560
EP  - 562
VL  - 5
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1969_5_3_a16/
LA  - ru
ID  - DE_1969_5_3_a16
ER  -