Hồng, Phạm Thị Thu, Amory- Mazaudier Christine, and Lê Huy Minh. “Ionospheric Conductivity from the Ionograms Recorded at Phu Thuy, Hanoi”. Vietnam Journal of Earth Sciences 34, no. 4 (March 14, 2013): 524–534. Accessed November 22, 2024. https://vjs.ac.vn/index.php/jse/article/view/2812.