TY  - JOUR
AU  - V. V. Grushin
TI  - On the proof of the discreteness of the spectrum of one class of differential operators in $\mathbb{R}^n$
JO  - Funkcionalʹnyj analiz i ego priloženiâ
PY  - 1971
SP  - 71
EP  - 72
VL  - 5
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/FAA_1971_5_1_a8/
LA  - ru
ID  - FAA_1971_5_1_a8
ER  -