TY  - JOUR
AU  - V. I. Burenkov
TI  - On the additivity of the classes of $W_p^{(r)}(\Omega )$
JO  - Informatics and Automation
PY  - 1967
SP  - 31
EP  - 55
VL  - 89
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/TRSPY_1967_89_a3/
LA  - ru
ID  - TRSPY_1967_89_a3
ER  -