%0 Journal Article
%A Israel Bertsein
%T Essential and inessential complexes.
%J Commentarii mathematici Helvetici
%D 1959
%P 70-80
%V 33
%I mathdoc
%U http://geodesic.mathdoc.fr/item/CMH_1959__33_139164/
%F CMH_1959__33_139164