Geodesic
On the sum of the differences of the eigenvalues of two singular Sturm--Liouville operators
Doklady Akademii Nauk, Tome 151 (1963) no. 5, pp. 1014-1017.

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     author = {M. G. Gasymov and B. M. Levitan},
     title = {On the sum of the differences of the eigenvalues of two singular {Sturm--Liouville} operators},
     journal = {Doklady Akademii Nauk},
     pages = {1014--1017},
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     volume = {151},
     number = {5},
     year = {1963},
     language = {ru},
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M. G. Gasymov; B. M. Levitan. On the sum of the differences of the eigenvalues of two singular Sturm--Liouville operators. Doklady Akademii Nauk, Tome 151 (1963) no. 5, pp. 1014-1017. http://geodesic.mathdoc.fr/item/DAN_1963_151_5_a4/