TY  - JOUR
AU  - Yu. G. Borisovich
TI  - Periodic solutions of equations in differential operators with a small parameter multiplying the derivative
JO  - Doklady Akademii Nauk
PY  - 1963
SP  - 255
EP  - 258
VL  - 148
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1963_148_2_a2/
LA  - ru
ID  - DAN_1963_148_2_a2
ER  -