@article{MZM_1985_38_5_a7,
     author = {P. A. Biryukov},
     title = {Spaces with bases and \ensuremath{\pi}-basis of finite rank},
     journal = {Matemati\v{c}eskie zametki},
     pages = {709--712},
     publisher = {mathdoc},
     volume = {38},
     number = {5},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1985_38_5_a7/}
}