%0 Journal Article
%A Johannes Huebschmann
%T Crossed n-folds extensions of groups and cohomology.
%J Commentarii mathematici Helvetici
%D 1980
%P 302-313
%V 55
%I mathdoc
%U http://geodesic.mathdoc.fr/item/CMH_1980__55_139827/
%F CMH_1980__55_139827