TY  - JOUR
AU  - A. A. Reinfeld
TI  - The reduction theorem for closed trajectories
JO  - Differencialʹnye uravneniâ
PY  - 1975
SP  - 1811
EP  - 1818
VL  - 11
IS  - 10
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1975_11_10_a10/
LA  - ru
ID  - DE_1975_11_10_a10
ER  -