Geodesic
On the eigenvalues of the Sturm–Liouville equation
Differencialʹnye uravneniâ, Tome 23 (1987) no. 11, pp. 2006-2008 
O. Ya. Savchenko. On the eigenvalues of the Sturm–Liouville equation. Differencialʹnye uravneniâ, Tome 23 (1987) no. 11, pp. 2006-2008. http://geodesic.mathdoc.fr/item/DE_1987_23_11_a23/
@article{DE_1987_23_11_a23,
     author = {O. Ya. Savchenko},
     title = {On the eigenvalues of the {Sturm{\textendash}Liouville} equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2006--2008},
     year = {1987},
     volume = {23},
     number = {11},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1987_23_11_a23/}
}
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