MATSUMOTO, Kengo. Construction and pure infiniteness of $C^*$-algebras associated with lambda-graph systems. Mathematica Scandinavica, Berkeley, CA, United States, v. 97, n. 1, p. 73–88, 2005. DOI: 10.7146/math.scand.a-14964. Disponível em: https://journals.msp.org/mscand/article/view/733. Acesso em: 25 jul. 2026.