Jaafar, Athir, and Mohd Norzali Mohd. “Smart Vending Machine Counter Using IoT”. Evolution of Information, Communication and Computing System 2, no. 1 (January 19, 2022): 63–75. Accessed April 8, 2026. https://publisher.uthm.edu.my/bookseries/index.php/eiccs/article/view/28.