@article{DAN_1990_314_1_a4,
     author = {V. D. Budaev},
     title = {A condition for the unconditional basis property for systems of},
     journal = {Doklady Akademii Nauk},
     pages = {25--28},
     year = {1990},
     volume = {314},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1990_314_1_a4/}
}