NATSUME, Toshikazu. The $C^*$-algebras of codimension one foliations without holonomy. Mathematica Scandinavica, Berkeley, CA, United States, v. 56, p. 96–104, 1985. DOI: 10.7146/math.scand.a-12090. Disponível em: https://journals.msp.org/mscand/article/view/1535. Acesso em: 25 jul. 2026.