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@article{DAN_1961_138_4_a1, author = {D. L. Berman}, title = {Extremal properties in the theory of polynomial operators}, journal = {Doklady Akademii Nauk}, pages = {747--750}, publisher = {mathdoc}, volume = {138}, number = {4}, year = {1961}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1961_138_4_a1/} }
D. L. Berman. Extremal properties in the theory of polynomial operators. Doklady Akademii Nauk, Tome 138 (1961) no. 4, pp. 747-750. http://geodesic.mathdoc.fr/item/DAN_1961_138_4_a1/