FAYAZ IBNI GH NABI. A Historical overview of Four Color Problem. Turkish Journal of Computer and Mathematics Education (TURCOMAT), [S. l.], v. 11, n. 3, p. 850–855, 2020. DOI: 10.17762/turcomat.v11i3.9090. Disponível em: https://turcomat.org/index.php/turkbilmat/article/view/9090. Acesso em: 8 may. 2024.