Geodesic
Тhe theorem of restoration simmetrical potential in the reverse problem of spectral analysis for operator of Sturm–Liouville
Fundamentalʹnaâ i prikladnaâ matematika, Tome 4 (1998) no. 2, pp. 535-541 
V. V. Dubrovskii; A. S. Velikikh. Тhe theorem of restoration simmetrical potential in the reverse problem of spectral analysis for operator of Sturm–Liouville. Fundamentalʹnaâ i prikladnaâ matematika, Tome 4 (1998) no. 2, pp. 535-541. http://geodesic.mathdoc.fr/item/FPM_1998_4_2_a4/
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     author = {V. V. Dubrovskii and A. S. Velikikh},
     title = {{\CYRT}he theorem of restoration simmetrical potential in the reverse problem of spectral analysis for operator of {Sturm{\textendash}Liouville}},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {535--541},
     year = {1998},
     volume = {4},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_1998_4_2_a4/}
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Voir la notice de l'article provenant de la source Math-Net.Ru

Theorem of existence and uniqueness of operator on mixture of eigevalues of two boundary problems (Dirichlet, Neyman) is proved.