PRYCE, J. D. Non Self-Determining Faces - An Example. Mathematica Scandinavica, Berkeley, CA, United States, v. 33, p. 21–22, 1973. DOI: 10.7146/math.scand.a-11467. Disponível em: https://journals.msp.org/mscand/article/view/2201. Acesso em: 25 jul. 2026.