J. Gwang Lee, J. Pil Lee, E. Su Mo, J. Hyeon Lee, K. su Yoon, and J. Kwang Lee, “Access control system using beacon-based indoor location data pattern analysis”, IJET, vol. 7, no. 2.12, pp. 325–328, Apr. 2018, doi: 10.14419/ijet.v7i2.12.11316.