Mohd Faizal, Muhammad Aliff Iqmal, and Muhammad Hazli Mazlan. “Development of Emergency Notification System for Passenger Lift Using IoT”. Evolution in Electrical and Electronic Engineering, vol. 4, no. 2, Oct. 2023, pp. 449-56, https://penerbit.uthm.edu.my/periodicals/index.php/eeee/article/view/12888.