Geodesic
Wigner–von Neumann quasi-isospectral manifolds
Fundamentalʹnaâ i prikladnaâ matematika, Tome 3 (1997) no. 1, pp. 151-152 
J. Cruz; R. Martinez; R. Navarro. Wigner–von Neumann quasi-isospectral manifolds. Fundamentalʹnaâ i prikladnaâ matematika, Tome 3 (1997) no. 1, pp. 151-152. http://geodesic.mathdoc.fr/item/FPM_1997_3_1_a8/
@article{FPM_1997_3_1_a8,
     author = {J. Cruz and R. Martinez and R. Navarro},
     title = {Wigner{\textendash}von~Neumann quasi-isospectral manifolds},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {151--152},
     year = {1997},
     volume = {3},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_1997_3_1_a8/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

Schrödinger operator in Wigner and von Neumann form is under consideration. The theorem about positive eigenvalues of this operator is formulated.