Trương Ngọc Sơn, Hồ Đắc Lộc, and Nguyễn Hùng. “Stabilizing Control for Two-Wheeled Self Balancing Robot”. Journal of Technical Education Science, vol. 7, no. 3, Sept. 2012, pp. 23-28, https://www.jte.edu.vn/index.php/jte/article/view/639.