TY  - JOUR
AU  - T. F. Ivanov
TI  - Determination of periodic motions in conservative systems with one degree of freedom
JO  - Doklady Akademii Nauk
PY  - 1962
SP  - 297
EP  - 300
VL  - 143
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1962_143_2_a13/
LA  - ru
ID  - DAN_1962_143_2_a13
ER  -