ALSUHIBANY , S. A. . Usability and Robustness Evaluation of Popular Electronic Services’ CAPTCHA in Saudi Arabia. JOURNAL OF ENGINEERING AND COMPUTER SCIENCES, [S. l.], v. 9, n. 2, p. 139–154, 2020. Disponível em: https://jecs.qu.edu.sa/index.php/jec/article/view/1891. Acesso em: 5 jun. 2025.