AGNARSSON, Geir. On chordal graphs and their chromatic polynomials. Mathematica Scandinavica, Berkeley, CA, United States, v. 93, n. 2, p. 240–246, 2003. DOI: 10.7146/math.scand.a-14421. Disponível em: https://journals.msp.org/mscand/article/view/798. Acesso em: 25 jul. 2026.