MathSciNet bibliographic data

MR1220499 (94h:53055) 53C23 (57N80 58E05) Perelʹman, G. Ya.; Petrunin, A. M. Extremal subsets in Aleksandrov spaces and the generalized Liberman theorem. (Russian) Algebra i Analiz 5 (1993), no. 1, 242--256; translation in St. Petersburg Math. J. 5 (1994), no. 1, 215--227

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