@article{DAN_1964_155_3_a4,
     author = {B. E. Veits},
     title = {Some characteristic properties of unconditional bases},
     journal = {Doklady Akademii Nauk},
     pages = {509--512},
     publisher = {mathdoc},
     volume = {155},
     number = {3},
     year = {1964},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1964_155_3_a4/}
}