%0 Journal Article %A I. K. Babenko %T Extremal problems of geometry, surgery on manifolds, and problems of group theory %J Izvestiya. Mathematics %D 1995 %P 321-332 %V 59 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM2_1995_59_2_a3/ %G en %F IM2_1995_59_2_a3