SMALL, Anthony. Remarks on a construction of Duistermaat. Mathematica Scandinavica, Berkeley, CA, United States, v. 94, n. 2, p. 202–206, 2004. DOI: 10.7146/math.scand.a-14439. Disponível em: https://journals.msp.org/mscand/article/view/780. Acesso em: 24 jul. 2026.