Phan, Huu Danh, and Hoang Mai Le. “Some Measures to Develop Mathematic Problem-Solving Competence for High School Students via Topic ‘Quadratic Inequalities With One Unknown - Math 10’”. Dong Thap University Journal of Science 12, no. 03S (July 30, 2023): 20–33. Accessed September 19, 2024. https://dthujs.vn/index.php/dthujs/article/view/1276.