The discreteness of the spectrum of the first boundary value problem for a nonregular elliptic equation
Differencialʹnye uravneniâ, Tome 20 (1984) no. 9, pp. 1602-1611.

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     author = {J. V. Rybalov},
     title = {The discreteness of the spectrum of the first boundary value problem for a nonregular elliptic equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1602--1611},
     publisher = {mathdoc},
     volume = {20},
     number = {9},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1984_20_9_a18/}
}
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J. V. Rybalov. The discreteness of the spectrum of the first boundary value problem for a nonregular elliptic equation. Differencialʹnye uravneniâ, Tome 20 (1984) no. 9, pp. 1602-1611. http://geodesic.mathdoc.fr/item/DE_1984_20_9_a18/