KECIC, K. J.; BRADLEY, P. A.; CANDER, L. R.; DICK, M. I.; ZOLESI, B. Further tests of the IRI and DGR model ionospheres. Annals of Geophysics, [S. l.], v. 37, n. 2, 1994. DOI: 10.4401/ag-4229. Disponível em: https://www.annalsofgeophysics.eu/index.php/annals/article/view/4229. Acesso em: 4 aug. 2021.