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 2024, 69 (5B), 130-136. https://doi.org/10.18173/2354-1075.2024-0141.