TY  - JOUR
AU  - S. A. Aldashev
TI  - A Criterion for the Existence of Eigenfunctions of the Darboux--Protter Spectral Problem for 

JO  - Differencialʹnye uravneniâ
PY  - 2005
SP  - 795
EP  - 801
VL  - 41
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_2005_41_6_a9/
LA  - ru
ID  - DE_2005_41_6_a9
ER  -