TY  - JOUR
AU  - P. I. Lizorkin
TI  - Classes of functions constructed on the basis of averages over spheres. (The case of spaces of Sobolev type)
JO  - Informatics and Automation
PY  - 1990
SP  - 122
EP  - 139
VL  - 192
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/TRSPY_1990_192_a10/
LA  - ru
ID  - TRSPY_1990_192_a10
ER  -