Minh Chau C, Thi Quynh V, Le Thuy T, Hoang Vu N. USING GEOGEBRA FOR TEACHING PROBLEMS ON FIXED POINTS OF FAMILIES OF LINES AND CIRCLES IN SECONDARY SCHOOL GEOMETRY. HNUE Journal of Science: Educational Science [Internet]. 2024 Dec. 27 [cited 2025 Dec. 14];69(5B):130-6. Available from: https://hnuejs.edu.vn/es/article/view/714