TY  - JOUR
AU  - M. Otelbaev
TI  - Estimates for the approximation numbers of operators connected with elliptic equations
JO  - Doklady Akademii Nauk
PY  - 1979
SP  - 783
EP  - 787
VL  - 248
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1979_248_4_a2/
LA  - ru
ID  - DAN_1979_248_4_a2
ER  -