TY  - JOUR
AU  - M. A. Krasnosel'skii
AU  - A. V. Pokrovskii
TI  - Operators of a problem on forced oscillations in systems with
JO  - Doklady Akademii Nauk
PY  - 1991
SP  - 819
EP  - 822
VL  - 319
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1991_319_4_a9/
LA  - ru
ID  - DAN_1991_319_4_a9
ER  -