Geodesic
Discrete spectrum of the Sturm–Liouville operator in the third boundary value problem for a truncated one-sheeted hyperboloid of revolution
Differencialʹnye uravneniâ, Tome 27 (1991) no. 10, pp. 1807-1812 
A. F. Ulitko; A. G. Kiselevskii; L. Shorfi. Discrete spectrum of the Sturm–Liouville operator in the third boundary value problem for a truncated one-sheeted hyperboloid of revolution. Differencialʹnye uravneniâ, Tome 27 (1991) no. 10, pp. 1807-1812. http://geodesic.mathdoc.fr/item/DE_1991_27_10_a18/
@article{DE_1991_27_10_a18,
     author = {A. F. Ulitko and A. G. Kiselevskii and L. Shorfi},
     title = {Discrete spectrum of the {Sturm{\textendash}Liouville} operator in the third boundary value problem for a truncated one-sheeted hyperboloid of revolution},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1807--1812},
     year = {1991},
     volume = {27},
     number = {10},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1991_27_10_a18/}
}
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