Geodesic
Extremal subsets in Aleksandrov spaces and the generalized Liberman theorem
Algebra i analiz, Tome 5 (1993) no. 1, pp. 242-256.

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     author = {G. Ya. Perel'man and Petrunin},
     title = {Extremal subsets in {Aleksandrov} spaces and the generalized {Liberman} theorem},
     journal = {Algebra i analiz},
     pages = {242--256},
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     volume = {5},
     number = {1},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_1993_5_1_a10/}
}
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G. Ya. Perel'man; Petrunin. Extremal subsets in Aleksandrov spaces and the generalized Liberman theorem. Algebra i analiz, Tome 5 (1993) no. 1, pp. 242-256. http://geodesic.mathdoc.fr/item/AA_1993_5_1_a10/