Gende, M., E. Mohíno Harris, C. Brunini, S. M. Radicella, and M. Herraiz. “Ionospheric Biases Correction for Coordinates Derived from GPS Single Point Positioning”. Annals of Geophysics 48, no. 3 (December 25, 2005). Accessed September 26, 2022. https://www.annalsofgeophysics.eu/index.php/annals/article/view/3207.