Geodesic
A criterion for discreteness of the spectrum of a Sturm--Liouville equation with an operator coefficient (apropos the article by B.~M.~Levitan and G.~A.~Suvorchenkova)
Funkcionalʹnyj analiz i ego priloženiâ, Tome 2 (1968) no. 2, pp. 63-67.

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     author = {V. P. Maslov},
     title = {A criterion for discreteness of the spectrum of a {Sturm--Liouville} equation with an operator coefficient (apropos the article by {B.~M.~Levitan} and {G.~A.~Suvorchenkova)}},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {63--67},
     publisher = {mathdoc},
     volume = {2},
     number = {2},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1968_2_2_a6/}
}
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V. P. Maslov. A criterion for discreteness of the spectrum of a Sturm--Liouville equation with an operator coefficient (apropos the article by B.~M.~Levitan and G.~A.~Suvorchenkova). Funkcionalʹnyj analiz i ego priloženiâ, Tome 2 (1968) no. 2, pp. 63-67. http://geodesic.mathdoc.fr/item/FAA_1968_2_2_a6/