Loc Nguyen, Phuong Nguyen Thi Lan, Cuong Dang Xuan. “The Development of Problem-Solving Competence Assessment Standards in Math for Vietnamese Students”. International Journal of Advanced Science and Technology 29, no. 08 (May 20, 2020): 354 - 373. Accessed February 9, 2025. http://sersc.org/journals/index.php/IJAST/article/view/17022.