MathSciNet bibliographic data MR608527 (82f:46073b) 46L55 (54H20 58G12) Cuntz, J. A class of \$C\sp{\ast} \$$C\sp{\ast}$-algebras and topological Markov chains. II. Reducible chains and the Ext-functor for \$C\sp{\ast} \$$C\sp{\ast}$-algebras. Invent. Math. 63 (1981), no. 1, 25–40. Article

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