TY  - JOUR
AU  - N. P. Morozov
TI  - Periodic solutions of the equation $\ddot x+\lambda f(ax+b\dot x)\dot x+x=0$
JO  - Differencialʹnye uravneniâ
PY  - 1986
SP  - 905
EP  - 907
VL  - 22
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1986_22_5_a29/
LA  - ru
ID  - DE_1986_22_5_a29
ER  -