Geodesic
On the proof of the discreteness of the spectrum of one class of differential operators in $\mathbb{R}^n$
Funkcionalʹnyj analiz i ego priloženiâ, Tome 5 (1971) no. 1, pp. 71-72 
V. V. Grushin. On the proof of the discreteness of the spectrum of one class of differential operators in $\mathbb{R}^n$. Funkcionalʹnyj analiz i ego priloženiâ, Tome 5 (1971) no. 1, pp. 71-72. http://geodesic.mathdoc.fr/item/FAA_1971_5_1_a8/
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