OLANREWAJU, O. T.; OSUNADE, O. Design of Accented Character-based CAPTCHA with Usability Test for Online Transactions. Zambia ICT Journal, [S. l.], v. 1, n. 1, p. 20–24, 2017. DOI: 10.33260/zictjournal.v1i1.14. Disponível em: https://ictjournal.icict.org.zm/index.php/zictjournal/article/view/14. Acesso em: 10 may. 2025.