Ideals in transformation-group $C^*$-algebras
  We characterize the ideal of continuous-trace elements in a separable transformation-group $C^{*}$-algebra $C_0(X)\times G$. In addition, we identify the largest Fell ideal, the largest liminal ideal and the largest postliminal ideal. 
Astrid an Huef (University of Denver), Dana P. Williams (Dartmouth   College)