Khổng, Chí Nguyện. “SOME ANALYSIS DIRECTIONS TO FIND SOLUTIONS FOR THE PRIMARY MOTION PROBLEM”. SCIENTIFIC JOURNAL OF TAN TRAO UNIVERSITY 7, no. 23 (December 8, 2021). Accessed March 28, 2024. https://tckh.daihoctantrao.edu.vn/index.php/sjttu/article/view/447.