%0 Journal Article
%A Samuel Eilenberg
%T Relations between cohomology groups in a complex.
%J Commentarii mathematici Helvetici
%D 1948
%P 302-320
%V 21
%I mathdoc
%U http://geodesic.mathdoc.fr/item/CMH_1948__21_138949/
%F CMH_1948__21_138949