Hoang Thi Thanh Ngan, and Ho Khanh Lam. “DESIGN DEVICE GAME ‘PING-PONG’ ON FPGA”. UTEHY Journal of Applied Science and Technology, Vol. 15, Oct. 2017, pp. 70-75, http://tapchi.utehy.edu.vn/index.php/jst/article/view/166.