NARASIMHA, C; SREEDEVI, M. Secured authentication using CAPTCHA and visualized passcode. International Journal of Engineering & Technology, [S. l.], v. 7, n. 1.8, p. 72–76, 2018. DOI: 10.14419/ijet.v7i1.8.9973. Disponível em: https://www.sciencepubco.com/index.php/ijet/article/view/9973.. Acesso em: 7 may. 2024.