Helly's theorem for $H$-convex sets
Doklady Akademii Nauk, Tome 226 (1976) no. 2, pp. 249-252.

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     author = {V. G. Boltyanskii},
     title = {Helly's theorem for $H$-convex sets},
     journal = {Doklady Akademii Nauk},
     pages = {249--252},
     publisher = {mathdoc},
     volume = {226},
     number = {2},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1976_226_2_a0/}
}
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V. G. Boltyanskii. Helly's theorem for $H$-convex sets. Doklady Akademii Nauk, Tome 226 (1976) no. 2, pp. 249-252. http://geodesic.mathdoc.fr/item/DAN_1976_226_2_a0/