Geodesic
Spectral problems for the Sturm–Liouville equation with a parameter. The geometry of finite-gap potentials
Doklady Akademii Nauk, Tome 317 (1991) no. 3, pp. 550-554 
I. S. Zakharevich. Spectral problems for the Sturm–Liouville equation with a parameter. The geometry of finite-gap potentials. Doklady Akademii Nauk, Tome 317 (1991) no. 3, pp. 550-554. http://geodesic.mathdoc.fr/item/DAN_1991_317_3_a7/
@article{DAN_1991_317_3_a7,
     author = {I. S. Zakharevich},
     title = {Spectral problems for the {Sturm{\textendash}Liouville} equation with a parameter. {The} geometry of finite-gap potentials},
     journal = {Doklady Akademii Nauk},
     pages = {550--554},
     year = {1991},
     volume = {317},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1991_317_3_a7/}
}
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