@article{DAN_1974_216_3_a9,
     author = {A. T. Taldykin},
     title = {On tests for a basis of {Hilbert} space},
     journal = {Doklady Akademii Nauk},
     pages = {505--508},
     publisher = {mathdoc},
     volume = {216},
     number = {3},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1974_216_3_a9/}
}