TY  - JOUR
AU  - Yu. P. Krivenkov
TI  - Necessary optimality conditions for a linear problem with second order differential equations of elliptic type in the presence of phase constraints
JO  - Doklady Akademii Nauk
PY  - 1977
SP  - 28
EP  - 31
VL  - 232
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1977_232_1_a5/
LA  - ru
ID  - DAN_1977_232_1_a5
ER  -