Geodesic
Chebyshev sets in Banach spaces
Doklady Akademii Nauk, Tome 121 (1958) no. 4, pp. 582-585 
N. V. Efimov; S. B. Stechkin. Chebyshev sets in Banach spaces. Doklady Akademii Nauk, Tome 121 (1958) no. 4, pp. 582-585. http://geodesic.mathdoc.fr/item/DAN_1958_121_4_a2/
@article{DAN_1958_121_4_a2,
     author = {N. V. Efimov and S. B. Stechkin},
     title = {Chebyshev sets in {Banach} spaces},
     journal = {Doklady Akademii Nauk},
     pages = {582--585},
     year = {1958},
     volume = {121},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1958_121_4_a2/}
}
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