TY  - JOUR
AU  - S. K. Bloshanskaya
TI  - On a necessary condition for being a basis
JO  - Differencialʹnye uravneniâ
PY  - 1981
SP  - 778
EP  - 788
VL  - 17
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1981_17_5_a1/
LA  - ru
ID  - DE_1981_17_5_a1
ER  -