BUJUKLIEV, N. An index formula in a class of groupoid $C^*$-algebras. Ann. Sofia Univ. Fac. Math. and Inf., [S. l.], v. 108, p. 23–28, 2021. DOI: 10.60063/gsu.fmi.108.23-28. Disponível em: https://ftl5.uni-sofia.bg/index.php/fmi/article/view/551. Acesso em: 4 dec. 2024.