%0 Journal Article
%A J. Cuntz
%T A Class of C*-algebras and Topological Markov Chains II: Reducible Chains and the Ext-functor for C*-algebras.
%J Inventiones mathematicae
%D 1981
%P 25-40
%V 63
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IM_1981__63_142789/
%F IM_1981__63_142789