Tong, Tiam Yong, and Nurfarina Zainal. “IoT-Based Portable and Tracking Device for Children Safety”. Evolution in Electrical and Electronic Engineering 4, no. 2 (October 26, 2023): 46–55. Accessed July 18, 2024. https://publisher.uthm.edu.my/periodicals/index.php/eeee/article/view/10820.