%0 Journal Article %A Crabb, M. J. %A Duncan, J. %A McGregor, C. M. %T Characterizations of commutativity for C*-algebras %J Glasgow mathematical journal %D 1974 %P 172-175 %V 15 %N 2 %U http://geodesic.mathdoc.fr/articles/10.1017/S0017089500002378/ %R 10.1017/S0017089500002378 %F 10_1017_S0017089500002378