%0 Journal Article %A A.J. Sieradski %T Combinatorial squashings, 3-manifolds, and the third homology of groups. %J Inventiones mathematicae %D 1986 %P 121-140 %V 84 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM_1986__84_143336/ %F IM_1986__84_143336