Geodesic
The inverse spectral problem for a power of the Laplace operator in the case of the Neuman problem on a parallelepiped
Vestnik Chelyabinskogo Gosudarstvennogo Universiteta. Matematika, Mekhanika, Informatika, no. 10 (2008), pp. 63-67 
A. I. Sedov; G. A. Zakirova. The inverse spectral problem for a power of the Laplace operator in the case of the Neuman problem on a parallelepiped. Vestnik Chelyabinskogo Gosudarstvennogo Universiteta. Matematika, Mekhanika, Informatika, no. 10 (2008), pp. 63-67. http://geodesic.mathdoc.fr/item/VCHGU_2008_10_a8/
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     title = {The inverse spectral problem for a power of the {Laplace} operator in the case of the {Neuman} problem on a parallelepiped},
     journal = {Vestnik Chelyabinskogo Gosudarstvennogo Universiteta. Matematika, Mekhanika, Informatika},
     pages = {63--67},
     year = {2008},
     number = {10},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VCHGU_2008_10_a8/}
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Voir la notice de l'article provenant de la source Math-Net.Ru

Sufficient conditions on a sequence of complex numbers for the coincidence with the spectrum of perturbed Laplace operator generated by the Neumann problem on n-dimensional parallelepiped are found.

[1] A. I. Sedov, G. A. Zakirova, “Obratnaya zadacha spektralnogo analiza dlya stepeni operatora Laplasa s potentsialom na parallelepipede”, Matematika. Mekhanika. Informatika : materialy Vseros. nauch. konf., Chelyab. gos. un-t, Chelyabinsk, 2007, 160—167

[2] A. I. Sedov, G. A. Zakirova, “O suschestvovanii i edinstvennosti resheniya obratnoi zadachi spektralnogo analiza dlya stepeni operatora Laplasa na parallelepipede”, Vestn. MaGU. Matematika, 2006, no. 9, 145—149, MaGU, Magnitogorsk

[3] E. Ch. Titchmarsh, Razlozheniya po sobstvennym funktsiyam, svyazannye s differentsialnymi uravneniyami vtorogo poryadka, v. 2, Inostr. lit., M., 1961 | MR