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@article{MZM_1994_56_2_a12, author = {A. P. Buslaev}, title = {On sufficient condition for coincidence of a spectrum and width}, journal = {Matemati\v{c}eskie zametki}, pages = {143--145}, publisher = {mathdoc}, volume = {56}, number = {2}, year = {1994}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1994_56_2_a12/} }
A. P. Buslaev. On sufficient condition for coincidence of a spectrum and width. Matematičeskie zametki, Tome 56 (1994) no. 2, pp. 143-145. http://geodesic.mathdoc.fr/item/MZM_1994_56_2_a12/