PRYCE, J. D. Non Self-Determining Faces - An Example. MATHEMATICA SCANDINAVICA, [S. l.], v. 33, p. 21–22, 1973. DOI: 10.7146/math.scand.a-11467. Disponível em: https://tidsskrift.dk/math/article/view/11467. Acesso em: 14 aug. 2026.