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Kasparov, G.G. (1981) The Operator K-Functor and Extensions of C*-Algebras. Mathematics of the USSR-Izvestiya, 16, 513-572.
https://doi.org/10.1070/IM1981v016n03ABEH001320

has been cited by the following article:

• TITLE: A Classification of Completely Positive Maps

  AUTHORS: Ruofei Wang, Shudong Liu, Changguo Wei

  KEYWORDS: Completely Positive Map, Extension, Ext-Group

  JOURNAL NAME: Journal of Applied Mathematics and Physics, Vol.10 No.12, December 26, 2022

  ABSTRACT: This paper concerns classifying completely positive maps between certain C*-algebras. Several invariants for classifying completely positive maps are constructed. It is proved that one of them is isomorphic to the Ext-group of C*-algebra extensions in special circumstances. Furthermore, this invariant induces a functor from C*-algebras to abelian groups which is split-exact.