TY  - JOUR
AU  - E. P. Bogomolova
TI  - Necessary conditions for the basis property in the direct sum of Sobolev spaces
JO  - Differencialʹnye uravneniâ
PY  - 1989
SP  - 722
EP  - 723
VL  - 25
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1989_25_4_a19/
LA  - ru
ID  - DE_1989_25_4_a19
ER  -