Nguyen Hoang Viet, Nguyen Thuy Duong, Nguyen Thanh Trung, and Nguyen Hong Thai. “Design of Internal Non-Circular Gear- Train With Improved Cycloid Profile”. Journal of Technical Education Science, vol. 15, no. 6, Dec. 2020, pp. 85-93, https://www.jte.edu.vn/index.php/jte/article/view/31.