%0 Journal Article %A Ellis, G. J. %T Non-abelian exterior products of groups and exact sequences in the homology of groups %J Glasgow mathematical journal %D 1987 %P 13-19 %V 29 %N 1 %U http://geodesic.mathdoc.fr/articles/10.1017/S0017089500006637/ %R 10.1017/S0017089500006637 %F 10_1017_S0017089500006637