AGNARSSON, Geir. Extremal graphs of order dimension 4. MATHEMATICA SCANDINAVICA, [S. l.], v. 90, n. 1, p. 5–12, 2002. DOI: 10.7146/math.scand.a-14358. Disponível em: https://www.mscand.dk/article/view/14358. Acesso em: 6 dec. 2025.