KOURIS, S. S. The solar-cycle variation of M(3000)F2 and its correlation with that of f0F2. Annals of Geophysics, [S. l.], v. 41, n. 4, 1998. DOI: 10.4401/ag-3804. Disponível em: https://www.annalsofgeophysics.eu/index.php/annals/article/view/3804. Acesso em: 21 may. 2022.