TY  - JOUR
AU  - V. I. Prokhorenko
TI  - Theorems on the smoothness of periodic solutions of differential
JO  - Doklady Akademii Nauk
PY  - 1991
SP  - 280
EP  - 283
VL  - 320
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1991_320_2_a4/
LA  - ru
ID  - DAN_1991_320_2_a4
ER  -