@article{KUIPM_1976_5_5_a9,
     author = {E. A. Begovatov},
     title = {Some properties of eigenvalues of the {Schr\"odinger} operator},
     journal = {Issledovaniya po Prikladnoi Matematike i Informatike},
     pages = {105--110},
     year = {1976},
     volume = {5},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/KUIPM_1976_5_5_a9/}
}