TY  - JOUR
AU  - A. I. Korotkii
TI  - On the extension of extremal problems that are connected with controllable elliptic systems
JO  - Differencialʹnye uravneniâ
PY  - 1989
SP  - 1518
EP  - 1522
VL  - 25
IS  - 9
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1989_25_9_a6/
LA  - ru
ID  - DE_1989_25_9_a6
ER  -