B. Prema Sindhuri, M. Kameswara Rao. “QR Code Based Multi Factor Authentication Protocol for IoT Networks”. International Journal of Advanced Science and Technology 29, no. 05 (April 30, 2020): 10656 - 10661. Accessed May 4, 2024. http://sersc.org/journals/index.php/IJAST/article/view/24194.