TY  - JOUR
AU  - P. L. Ul'yanov
TI  - Imbedding theorems and best approximations
JO  - Doklady Akademii Nauk
PY  - 1969
SP  - 1044
EP  - 1047
VL  - 184
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1969_184_5_a6/
LA  - ru
ID  - DAN_1969_184_5_a6
ER  -