Duong, T. H., M. K. Hoang, and A. V. Trinh. “Enhancing the Accuracy of Indoor Positioning Using System Delay Time Compensation”. International Journal of Machine Learning and Networked Collaborative Engineering, vol. 4, no. 3, June 2021, pp. 109-16, https://mlnce.net/index.php/Home/article/view/153.