Geodesic
Some criteria for discreteness of the negative part of the spectrum of a linear differential operator
Differencialʹnye uravneniâ, Tome 21 (1985) no. 4, pp. 728-731.

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     author = {V. I. Filippenko},
     title = {Some criteria for discreteness of the negative part of the spectrum of a linear differential operator},
     journal = {Differencialʹnye uravneni\^a},
     pages = {728--731},
     publisher = {mathdoc},
     volume = {21},
     number = {4},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1985_21_4_a23/}
}
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V. I. Filippenko. Some criteria for discreteness of the negative part of the spectrum of a linear differential operator. Differencialʹnye uravneniâ, Tome 21 (1985) no. 4, pp. 728-731. http://geodesic.mathdoc.fr/item/DE_1985_21_4_a23/