TY  - JOUR
AU  - M. Otelbaev
TI  - Letter to the editors: “A criterion for discreteness of the spectrum for a degenerate operator, and certain imbedding theorems” (Differencial'nye Uravnenija 13 (1977), no. 1, 111–120)
JO  - Differencialʹnye uravneniâ
PY  - 1977
SP  - 2288
VL  - 13
IS  - 12
UR  - http://geodesic.mathdoc.fr/item/DE_1977_13_12_a21/
LA  - ru
ID  - DE_1977_13_12_a21
ER  -