Geodesic
Letter to the editors: “On the $\epsilon$-core of a bounded set in a special metric space”
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 1 (2002), pp. 81-82 
E. N. Sosov. Letter to the editors: “On the $\epsilon$-core of a bounded set in a special metric space”. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 1 (2002), pp. 81-82. http://geodesic.mathdoc.fr/item/IVM_2002_1_a13/
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     title = {Letter to the editors: {{\textquotedblleft}On} the $\epsilon$-core of a~bounded set in a~special metric space{\textquotedblright}},
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[1] Sosov E. N., “On existence and uniqueness of Chebyshev center of a bounded set in a special geodesic space”, Lobachevskii J. of Math., 7 (2000), 43–45 | MR | Zbl

[2] Efremovich V. A., “Neekvimorfnost prostranstv Evklida i Lobachevskogo”, UMN, 4:2 (1949), 178–179

[3] Buzeman G., Geometriya geodezicheskikh, Fizmatgiz, M., 1962, 504 pp. | MR