The Structure of the Crossed Product C*-Algebras: A Proof of the Generalized Effros-Hahn Conjecture. Elliot C. Gootman; J. Rosenberg — 1979 Inventiones mathematicae
Spectra of actions on type I C*-algebras. Elliot C. Gootman; Dorte Olesen — 1980 Mathematica Scandinavica