TY  - JOUR
AU  - V. S. Mel'nik
TI  - Extremal problems for operator-differential systems
JO  - Doklady Akademii Nauk
PY  - 1990
SP  - 101
EP  - 105
VL  - 314
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1990_314_1_a23/
LA  - ru
ID  - DAN_1990_314_1_a23
ER  -