Geodesic
Sufficient conditions for a discrete spectrum in the case of a Sturm--Liouville equation with operator coefficients
Funkcionalʹnyj analiz i ego priloženiâ, Tome 2 (1968) no. 2, pp. 56-62.

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     author = {B. M. Levitan and G. A. Suvorchenkova},
     title = {Sufficient conditions for a discrete spectrum in the case of a {Sturm--Liouville} equation with operator coefficients},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {56--62},
     publisher = {mathdoc},
     volume = {2},
     number = {2},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1968_2_2_a5/}
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B. M. Levitan; G. A. Suvorchenkova. Sufficient conditions for a discrete spectrum in the case of a Sturm--Liouville equation with operator coefficients. Funkcionalʹnyj analiz i ego priloženiâ, Tome 2 (1968) no. 2, pp. 56-62. http://geodesic.mathdoc.fr/item/FAA_1968_2_2_a5/