Pham Thi Thu, Hong, Mazaudier Christine Amory, Minh Le Huy, Saito Susumu, Dung Nguyen Thanh, Ngoc Luong Thi, Hung Luu Viet, et al. “Occurrence Rate of Equatorial Spread F and GPS ROTI in the Ionospheric Anomaly Region over Vietnam”. <i>Vietnam Journal of Earth Sciences</i> 46, no. 4 (August 19, 2024): 553–569. Accessed November 8, 2025. http://vjes.vast.vn/jse/article/view/21368.