TY  - JOUR
AU  - M. N. Eliseenko
TI  - Periodic solutions of second-order ordinary differential equations not solved with respect to the derivative
JO  - Differencialʹnye uravneniâ
PY  - 1985
SP  - 1618
EP  - 1621
VL  - 21
IS  - 9
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1985_21_9_a21/
LA  - ru
ID  - DE_1985_21_9_a21
ER  -