Sulaiman, Mariam Taha, and Nidaa Flaih Hassan. “Generate Random Arabic Characters and Numbers for CAPTCHA”. Iraqi Journal of Science 58, no. 4C (January 8, 2018): 2427–2437. Accessed December 6, 2025. https://www.ijs.uobaghdad.edu.iq/index.php/eijs/article/view/22.