@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/}
}