The stability of the system of eigenvalues and eigenfunctions of the Sturm--Liouville problem
Differencialʹnye uravneniâ, Tome 7 (1971) no. 9, pp. 1667-1671.

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     author = {P. K. Senatorov},
     title = {The stability of the system of eigenvalues and eigenfunctions of the {Sturm--Liouville} problem},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1667--1671},
     publisher = {mathdoc},
     volume = {7},
     number = {9},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1971_7_9_a13/}
}
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P. K. Senatorov. The stability of the system of eigenvalues and eigenfunctions of the Sturm--Liouville problem. Differencialʹnye uravneniâ, Tome 7 (1971) no. 9, pp. 1667-1671. http://geodesic.mathdoc.fr/item/DE_1971_7_9_a13/