%0 Journal Article %A A. Ya. Helemskii %T The homological essence of Connes amenability: injectivity of the predual bimodule %J Sbornik. Mathematics %D 1991 %P 555-566 %V 68 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/SM_1991_68_2_a10/ %G en %F SM_1991_68_2_a10