D. N. Bora, P. M. Bora, D. V. S. Tidake, G. P. Dhomse, and D. P. Pawar, “AI-driven biometric CAPTCHA: defending against automated threats in web security”, IJBAS, vol. 14, no. 1, pp. 32–39, Apr. 2025, doi: 10.14419/fab5t109.