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@article{DAN_1986_291_5_a5, author = {G. A. Isaev and T. Yu. Kuliev}, title = {Analytic properties of the boundary of the numerical range of}, journal = {Doklady Akademii Nauk}, pages = {1050--1053}, publisher = {mathdoc}, volume = {291}, number = {5}, year = {1986}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1986_291_5_a5/} }
G. A. Isaev; T. Yu. Kuliev. Analytic properties of the boundary of the numerical range of. Doklady Akademii Nauk, Tome 291 (1986) no. 5, pp. 1050-1053. http://geodesic.mathdoc.fr/item/DAN_1986_291_5_a5/