GIBLIN, P. J.; HOLTOM, P. A. Affine-Distance symmetry sets. Mathematica Scandinavica, Berkeley, CA, United States, v. 93, n. 2, p. 247–267, 2003. DOI: 10.7146/math.scand.a-14422. Disponível em: https://journals.msp.org/mscand/article/view/797. Acesso em: 25 jul. 2026.