TY  - JOUR
AU  - Ya. Z. Tsypkin
AU  - A. S. Poznyak
TI  - A generalized method of instrumental variables in problems of the
JO  - Doklady Akademii Nauk
PY  - 1989
SP  - 1068
EP  - 1072
VL  - 306
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1989_306_5_a9/
LA  - ru
ID  - DAN_1989_306_5_a9
ER  -