Khaleel Ebraheem, S., سندس, R. Jassim Al-Atiwi, and رهام. “Traffic Sign Recognition by Using Chain Code”. AL-Rafidain Journal of Computer Sciences and Mathematics, vol. 9, no. 2, June 2025, pp. 113-26, https://rjps.uomosul.edu.iq/index.php/csmj/article/view/19790.