TY  - JOUR
AU  - J. Cuntz
TI  - A Class of C*-algebras and Topological Markov Chains II: Reducible Chains and the Ext-functor for C*-algebras.
JO  - Inventiones mathematicae
PY  - 1981
SP  - 25
EP  - 40
VL  - 63
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IM_1981__63_142789/
ID  - IM_1981__63_142789
ER  -