RENZ, Peter L. The Contractibility of the Homeomorphism Group of Some Product Spaces by Wong’s Method. Mathematica Scandinavica, Berkeley, CA, United States, v. 28, p. 182–188, 1971. DOI: 10.7146/math.scand.a-11014. Disponível em: https://journals.msp.org/mscand/article/view/2282. Acesso em: 25 jul. 2026.