Eigenvalue problems for differential equations of the second order in Banach and Hilbert spaces
Differencialʹnye uravneniâ, Tome 2 (1966) no. 9, pp. 1151-1160.

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     author = {G. I. Laptev},
     title = {Eigenvalue problems for differential equations of the second order in {Banach} and {Hilbert} spaces},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1151--1160},
     publisher = {mathdoc},
     volume = {2},
     number = {9},
     year = {1966},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1966_2_9_a1/}
}
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G. I. Laptev. Eigenvalue problems for differential equations of the second order in Banach and Hilbert spaces. Differencialʹnye uravneniâ, Tome 2 (1966) no. 9, pp. 1151-1160. http://geodesic.mathdoc.fr/item/DE_1966_2_9_a1/