@article{RM_1973_28_6_a0,
     author = {L. P. Vlasov},
     title = {Approximative properties of sets in normed linear spaces},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {1--66},
     publisher = {mathdoc},
     volume = {28},
     number = {6},
     year = {1973},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1973_28_6_a0/}
}