Trang, Nguyen Thu, Roland T. Tsunoda, and Le Huy Minh. “On New Detailed Ionogram Signatures of Equatorial Plasma Bubbles from Non-Equatorial Station During Low Solar Activity”. <i>Vietnam Journal of Earth Sciences</i> 37, no. 4 (December 5, 2015): 307–317. Accessed January 9, 2026. https://vjes.vast.vn/jse/article/view/8059.