NAVANSH GOEL; TEJASWI KUMAR; C. OSWALD. A Novel and Efficient Multilayered Approach to CAPTCHA: Design, Performance and Usability Evaluation. International Journal of Computer Information Systems and Industrial Management Applications, [S. l.], v. 15, p. 22, 2023. Disponível em: https://cspub-ijcisim.org/index.php/ijcisim/article/view/562. Acesso em: 13 nov. 2024.