PALMSTRØM, M. Exotic groupoid $C^*$-algebras associated to double groupoids. MATHEMATICA SCANDINAVICA, [S. l.], v. 130, n. 3, 2024. DOI: 10.7146/math.scand.a-149438. Disponível em: https://www.mscand.dk/article/view/149438. Acesso em: 10 dec. 2024.