Geodesic
Chebyshev sets, continuity of the metric projection and certain geometric properties of the unit sphere in a~Banach space
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 4 (1969), pp. 38-46.

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     author = {E. V. Oshman},
     title = {Chebyshev sets, continuity of the metric projection and certain geometric properties of the unit sphere in {a~Banach} space},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {38--46},
     publisher = {mathdoc},
     number = {4},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1969_4_a7/}
}
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E. V. Oshman. Chebyshev sets, continuity of the metric projection and certain geometric properties of the unit sphere in a~Banach space. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 4 (1969), pp. 38-46. http://geodesic.mathdoc.fr/item/IVM_1969_4_a7/