Mahesh A. Patil, Pravin S. Patil, Suraj B. Patil, and Kishor V. Pol. “Students Attendance and Classroom Automation System Using IoT”. International Journal of Advance Research in Engineering, Science & Technology, vol. 5, no. 4, Apr. 2018, pp. 225-9, https://ijarest.org/index.php/ijarest/article/view/1452.