TY  - JOUR
AU  - G. Ya. Perel'man
AU  - Petrunin
TI  - Extremal subsets in Aleksandrov spaces and the generalized Liberman theorem
JO  - Algebra i analiz
PY  - 1993
SP  - 242
EP  - 256
VL  - 5
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AA_1993_5_1_a10/
LA  - ru
ID  - AA_1993_5_1_a10
ER  -