@article{10_1017_S0017089500002378,
     author = {Crabb, M. J. and Duncan, J. and McGregor, C. M.},
     title = {Characterizations of commutativity for {C*-algebras}},
     journal = {Glasgow mathematical journal},
     pages = {172--175},
     year = {1974},
     volume = {15},
     number = {2},
     doi = {10.1017/S0017089500002378},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500002378/}
}