On a mapping of a Hilbert space into itself
Doklady Akademii Nauk, Tome 141 (1961) no. 5, pp. 1042-1044.

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     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/}
}
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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/