@article{MZM_1969_5_4_a9,
     author = {A. S. Markus},
     title = {Bari bases of subspaces},
     journal = {Matemati\v{c}eskie zametki},
     pages = {461--469},
     year = {1969},
     volume = {5},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1969_5_4_a9/}
}