Nguyen Huu Chuc, Ngo Viet Anh Van, Tran Dai Hieu, and Nguyen Van Anh. “DESIGN AND MANUFACTURE A HARVESTING MACHINE FOR CENTELLA ASIATICA”. UTEHY Journal of Applied Science and Technology, Vol. 15, Oct. 2017, pp. 34-38, http://jst.utehy.edu.vn/index.php/jst/article/view/160.