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@article{DAN_1970_192_6_a9, author = {R. L. Frum-Ketkov}, title = {Mappings in {Hilbert} space}, journal = {Doklady Akademii Nauk}, pages = {1231--1234}, publisher = {mathdoc}, volume = {192}, number = {6}, year = {1970}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1970_192_6_a9/} }
R. L. Frum-Ketkov. Mappings in Hilbert space. Doklady Akademii Nauk, Tome 192 (1970) no. 6, pp. 1231-1234. http://geodesic.mathdoc.fr/item/DAN_1970_192_6_a9/