Khổng, Nguyện, and Tuong Tran. “THE AREA METHOD AT THE PRIMARY LEVEL WITH MEDIAN LINE PROBLEMS”. SCIENTIFIC JOURNAL OF TAN TRAO UNIVERSITY 8, no. 4 (January 4, 2023). Accessed November 23, 2024. https://tckh.daihoctantrao.edu.vn/index.php/sjttu/article/view/782.