Karthikeyan, M, and A R Arunachalam. “Enhancing User Accessibility in CAPTCHA Systems Without Compromising Security”. International Academic Journal of Science and Engineering 13, no. 1 (March 30, 2026): 497–509. Accessed November 7, 2026. https://iaiest.com/iaj/index.php/IAJSE/article/view/IAJSE1346.