MUHLY, Paul S.; WILLIAMS, Dana P. Continuous Trace Groupoid $C^*$-Algebras, II. MATHEMATICA SCANDINAVICA, [S. l.], v. 70, p. 127–145, 1992. DOI: 10.7146/math.scand.a-12390. Disponível em: https://tidsskrift.dk/math/article/view/12390. Acesso em: 13 aug. 2026.