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@article{FAA_1985_19_1_a13, author = {V. Ya. Ivrii}, title = {Asymptotics of the discrete spectrum for certain operators in $\mathbb{R}^d$}, journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a}, pages = {73--74}, publisher = {mathdoc}, volume = {19}, number = {1}, year = {1985}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/FAA_1985_19_1_a13/} }
V. Ya. Ivrii. Asymptotics of the discrete spectrum for certain operators in $\mathbb{R}^d$. Funkcionalʹnyj analiz i ego priloženiâ, Tome 19 (1985) no. 1, pp. 73-74. http://geodesic.mathdoc.fr/item/FAA_1985_19_1_a13/
[1] Ivrii V.Ya., DAN SSSR, 276:2 (1984), 268–270 | MR