Geodesic
Centers and radii of graphs
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 32 (1977) no. 6 
G. N. Kopylov; E. A. Timofeev. Centers and radii of graphs. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 32 (1977) no. 6. http://geodesic.mathdoc.fr/item/RM_1977_32_6_a14/
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     author = {G. N. Kopylov and E. A. Timofeev},
     title = {Centers and radii of graphs},
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     volume = {32},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1977_32_6_a14/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

[1] A. A. Zykov, Teoriya konechnykh grafov, Nauka, Novosibirsk, 1969 | Zbl

[2] F. Kharari, Teoriya grafov, Mir, M., 1973 | MR

[3] C. Jordan, “Sur les assemblages de lignes”, J. Reine Angew. Math., 70 (1869), 185–190 | Zbl