SAYYAD LIYAKAT, K. K. . Implementation of E-mail Security with Three Layers of Authentication. JOURNAL OF OPERATING SYSTEMS DEVELOPMENT & TRENDS, [S. l.], v. 9, n. 2, p. 29–35, 2022. Disponível em: https://stmcomputers.stmjournals.com/index.php/JoOSDT/article/view/400. Acesso em: 5 may. 2024.