%0 Journal Article %A T. Banakh %A V. Gavrylkiv %A O. Nykyforchyn %T Algebra in superextensions of groups, I: zeros and commutativity %J Algebra and discrete mathematics %D 2008 %P 1-29 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/ADM_2008_3_a0/ %G en %F ADM_2008_3_a0