Kecic KJ, Bradley PA, Cander LR, Dick MI, Zolesi B. Further tests of the IRI and DGR model ionospheres. Ann. Geophys. [Internet]. 1994 Nov. 25 [cited 2026 Apr. 6];37(2). Available from: https://www.annalsofgeophysics.eu/index.php/annals/article/view/4229