K. Shanthi. “Secure Lightweight Multi-Factor Authentication Scheme for Three-Layer Architecture: User-Fog-Cloud Environment”. International Journal of Intelligent Systems and Applications in Engineering 12, no. 3 (March 24, 2024): 3040–3048. Accessed July 22, 2024. https://ijisae.org/index.php/IJISAE/article/view/5895.