@article{MZM_1973_13_4_a7,
     author = {A. I. Vasil'ev},
     title = {Structure of balls and uniqueness subspaces in a~linear metric space},
     journal = {Matemati\v{c}eskie zametki},
     pages = {541--550},
     publisher = {mathdoc},
     volume = {13},
     number = {4},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1973_13_4_a7/}
}