MathSciNet bibliographic data MR582160 58G12 (46M20 55N15) Kasparov, G. G. The operator \$K\$$K$-functor and extensions of \$C\sp{\ast} \$$C\sp{\ast}$-algebras. (Russian) Izv. Akad. Nauk SSSR Ser. Mat. 44 (1980), no. 3, 571–636, 719. Links to the journal or article are not yet available

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