Iain Raeburn and Dana P. Williams, Topological invariants associated to the spectrum of crossed product C*-algebras, J. Funct. Anal. 116 (1993), 245-276.

Iain Raeburn and Dana P. Williams, Dixmier-Douady classes of dynamical systems and crossed products, Canad. J. Math. 45 (1993), 1032-1066.

Paul S. Muhly and Dana P. Williams, Groupoid cohomology and the Dixmier-Douady class, Proc. London Math. Soc. (3), pages 109-134, 1995.

Siegfried Echterhoff and Dana P. Williams, Crossed products whose primitive ideal spaces are generalized trivial -bundles, Math. Ann. 302 (1995), 269-294.

Alexander Kumjian, Iain Raeburn, and Dana P. Williams, The equivariant Brauer groups of commuting free and proper actions are isomorphic, Proc. Amer. Math. Soc. 124 (1996), 809-817.

Paul S. Muhly, Jean N. Renault, and Dana P. Williams, Continuous-trace groupoid C*-algebras, III, Trans. Amer. Math. Soc., pages 3621-3641, 1996.

David Crocker, Alexander Kumjian, Iain Raeburn, and Dana P. Williams, An equivariant Brauer group and actions of groups on -algebras, J. Funct. Anal. 146 (1997), 151-184.

Judith A. Packer, Iain Raeburn, and Dana P. Williams, The equivariant Brauer group of principal bundles, J. Operator Theory 36 (1996), 73-105.