Hồng PTT, Mazaudier Christine A-, Minh LH. Ionospheric conductivity from the ionograms recorded at Phu Thuy, Hanoi. Vietnam J. Earth Sci. [Internet]. 2013 Mar. 14 [cited 2024 Nov. 25];34(4):524-3. Available from: https://vjs.ac.vn/index.php/jse/article/view/2812