1. Classifying space for proper actions and K-theory of group C⁎-algebras;Baum;Contemp. Math.,1994
2. K-Theory for Operator Algebras;Blackadar,1998
3. A completely bounded characterization of operator algebras;Blecher;Math. Ann.,1995
4. A characterization of operator algebras;Blecher;J. Funct. Anal.,1990