TY  - JOUR
AU  - V. I. Arkin
AU  - V. L. Levin
TI  - A variational problem with functions of several variables and operator restrictions: The maximum principle and existence theorem
JO  - Doklady Akademii Nauk
PY  - 1971
SP  - 9
EP  - 12
VL  - 200
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1971_200_1_a0/
LA  - ru
ID  - DAN_1971_200_1_a0
ER  -