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@article{KUIPM_1976_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}, publisher = {mathdoc}, year = {1976}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/KUIPM_1976_a9/} }
E. A. Begovatov. Some properties of eigenvalues of the Schr\"odinger operator. Issledovaniya po Prikladnoi Matematike i Informatike, Issledovaniya po Prikladnoi Matematike (1976), pp. 105-110. http://geodesic.mathdoc.fr/item/KUIPM_1976_a9/