DUPONT, Luis A.; VILLARREAL, Rafael H. Edge ideals of clique clutters of comparability graphs and the normality of monomial ideals. Mathematica Scandinavica, Berkeley, CA, United States, v. 106, n. 1, p. 88–98, 2010. DOI: 10.7146/math.scand.a-15126. Disponível em: https://journals.msp.org/mscand/article/view/571. Acesso em: 8 sep. 2026.