SULLIVAN ANDERSON, S.; CHARTRAND, G. The Lattice-Graph of the Topology of a Transitive Directed Graph. Mathematica Scandinavica, Berkeley, CA, United States, v. 21, p. 105–109, 1967. DOI: 10.7146/math.scand.a-10849. Disponível em: https://journals.msp.org/mscand/article/view/2477. Acesso em: 25 jul. 2026.