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@article{MZM_1979_26_5_a8, author = {B. M. Makarov}, title = {A~certain characteristic of {a~Hilbert} space}, journal = {Matemati\v{c}eskie zametki}, pages = {739--746}, publisher = {mathdoc}, volume = {26}, number = {5}, year = {1979}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1979_26_5_a8/} }
B. M. Makarov. A~certain characteristic of a~Hilbert space. Matematičeskie zametki, Tome 26 (1979) no. 5, pp. 739-746. http://geodesic.mathdoc.fr/item/MZM_1979_26_5_a8/