MAHITTHIBURIN, S.; BOONKRONG, S. Improving Security with Two-factor Authentication Using Image. Applied Science and Engineering Progress, [S. l.], v. 8, n. 1, p. 33–43, 2015. Disponível em: https://ph02.tci-thaijo.org/index.php/ijast/article/view/67461. Acesso em: 18 sep. 2026.