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@article{DAN_1982_265_4_a0, author = {D. L. Berman}, title = {Solution of an extremal problem in operator theory}, journal = {Doklady Akademii Nauk}, pages = {777--781}, publisher = {mathdoc}, volume = {265}, number = {4}, year = {1982}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1982_265_4_a0/} }
D. L. Berman. Solution of an extremal problem in operator theory. Doklady Akademii Nauk, Tome 265 (1982) no. 4, pp. 777-781. http://geodesic.mathdoc.fr/item/DAN_1982_265_4_a0/