Multi-Step Factor Based Authentication Control to Access Cloud Services. International Journal of Advance Engineering and Research Development (IJAERD), [S. l.], v. 4, n. 11, p. 1149–1157, 2017. Disponível em: https://ijaerd.org/index.php/IJAERD/article/view/4292. Acesso em: 10 sep. 2025.