@article{MZM_1967_2_2_a9,
     author = {L. P. Vlasov},
     title = {Chebyshev sets and approximately convex sets},
     journal = {Matemati\v{c}eskie zametki},
     pages = {191--200},
     publisher = {mathdoc},
     volume = {2},
     number = {2},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1967_2_2_a9/}
}