NOORI, N. S.; TAWFIQ, I. M. Coloring Graph and Four-Color Theorem. Journal for Research in Applied Sciences and Biotechnology, [S. l.], v. 2, n. 5, p. 99–104, 2023. DOI: 10.55544/jrasb.2.5.16. Disponível em: https://jrasb.stallionpublication.com/index.php/jrasb/article/view/330. Acesso em: 7 jul. 2024.