SMALL, A. Remarks on a construction of Duistermaat. MATHEMATICA SCANDINAVICA, [S. l.], v. 94, n. 2, p. 202–206, 2004. DOI: 10.7146/math.scand.a-14439. Disponível em: https://www.mscand.dk/article/view/14439. Acesso em: 3 may. 2024.