TY  - JOUR
AU  - A. S. Pechentsov
TI  - Basis properties of eigenfunctions of a boundary value problem in the case of a multiple root of the characteristic polynomial
JO  - Differencialʹnye uravneniâ
PY  - 1988
SP  - 703
EP  - 705
VL  - 24
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1988_24_4_a25/
LA  - ru
ID  - DE_1988_24_4_a25
ER  -