LARSEN, N. S.; RAEBURN, I. Faithful representations of crossed products by actions of $\boldsymbol N^k$. MATHEMATICA SCANDINAVICA, [S. l.], v. 89, n. 2, p. 283–296, 2001. DOI: 10.7146/math.scand.a-14342. Disponível em: https://www.mscand.dk/article/view/14342. Acesso em: 23 nov. 2024.