%0 Journal Article
%A B. Eckmann
%A P.J. Hilton
%T On Central Group Extensions and Homology
%J Commentarii mathematici Helvetici
%D 1971
%P 345-355
%V 46
%I mathdoc
%U http://geodesic.mathdoc.fr/item/CMH_1971__46_139482/
%F CMH_1971__46_139482