J. . A. A. Mukred, “Outdoor Elderly Tracking System Using Line Tracking Mobile Robot with Bluetooth Communication System”, EEEE, vol. 1, no. 1, pp. 378–387, Oct. 2020, Accessed: Jul. 18, 2024. [Online]. Available: https://penerbit.uthm.edu.my/periodicals/index.php/eeee/article/view/289