Panca, Billy Susanto, Yansen Paulus, and Oscar Karnalim. “An Automated Attendance System in Academia With Implicit Authentication via Mobile Devices and Wi-Fi Connection”. International Journal of Online and Biomedical Engineering (iJOE) 16, no. 07 (June 19, 2020): pp. 86–94. Accessed August 20, 2022. https://online-journals.org/index.php/i-joe/article/view/13869.