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@article{DAN_1961_141_5_a9, author = {S. S. Ryshkov}, title = {On a mapping of a {Hilbert} space into itself}, journal = {Doklady Akademii Nauk}, pages = {1042--1044}, publisher = {mathdoc}, volume = {141}, number = {5}, year = {1961}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1961_141_5_a9/} }
S. S. Ryshkov. On a mapping of a Hilbert space into itself. Doklady Akademii Nauk, Tome 141 (1961) no. 5, pp. 1042-1044. http://geodesic.mathdoc.fr/item/DAN_1961_141_5_a9/