FUKUYAMA, Junichiro. NP-completeness of the Planar Separator Problems. Journal of Graph Algorithms and Applications, [S. l.], v. 10, n. 2, p. 317–328, 2006. DOI: 10.7155/jgaa.00130. Disponível em: http://jgaa-v4.cs.brown.edu/index.php/jgaa/article/view/paper130. Acesso em: 6 jul. 2024.