TIAN, Yuan. Uniform Transformation Groups on Lower Dimensional Spaces. Mathematica Scandinavica, Berkeley, CA, United States, v. 79, p. 101–129, 1996. DOI: 10.7146/math.scand.a-12595. Disponível em: https://journals.msp.org/mscand/article/view/1077. Acesso em: 25 jul. 2026.