TY  - JOUR
AU  - V. A. Gorelov
TI  - On the change of a finite number of elements in a system of root functions of a differential operator without loss of the basis property
JO  - Differencialʹnye uravneniâ
PY  - 1997
SP  - 33
EP  - 38
VL  - 33
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1997_33_1_a5/
LA  - ru
ID  - DE_1997_33_1_a5
ER  -