@article{DAN_1976_229_3_a4,
     author = {S. A. Peregudov},
     title = {On $\Pi$-uniform bases and $\pi$-bases},
     journal = {Doklady Akademii Nauk},
     pages = {542--545},
     publisher = {mathdoc},
     volume = {229},
     number = {3},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1976_229_3_a4/}
}