@article{MZM_1970_7_5_a7,
     author = {L. P. Vlasov},
     title = {Approximate properties of sets in {Banach} spaces},
     journal = {Matemati\v{c}eskie zametki},
     pages = {593--604},
     publisher = {mathdoc},
     volume = {7},
     number = {5},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1970_7_5_a7/}
}