E. M. EL-KHOLY; H. AHMED. Perfect Folding of Graphs. Global Journal of Science Frontier Research, [S. l.], v. 21, n. F1, p. 7–15, 2021. Disponível em: https://journalofscience.org/index.php/GJSFR/article/view/2887. Acesso em: 5 may. 2024.