Kwak, Eun-Shin, and Eon-Gon Kim. “Design of Access Control and Positioning System Based on Beacon”. International Journal of Engineering and Technology 7, no. 3.24 (August 10, 2018): 232–236. Accessed August 17, 2025. https://mail.sciencepubco.com/index.php/IJET/article/view/22652.