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: https://jgaa.info/index.php/jgaa/article/view/paper304. Acesso em: 30 jun. 2024.