DAS SARMA, Atish; GAJEWAR, Amita; LIPTON, Richard; NANONGKAI, Danupon. An Approximate Restatement of the Four-Color Theorem. Journal of Graph Algorithms and Applications, [S. l.], v. 17, n. 5, p. 567–573, 2013. DOI: 10.7155/jgaa.00304. Disponível em: http://jgaa-v4.cs.brown.edu/index.php/jgaa/article/view/paper304. Acesso em: 2 jul. 2024.