LASTOVICKA, J.; MLCH, P. Solar cycle effect on oscillations in the period range of 2-20 days in the F region of the ionosphere. Annals of Geophysics, [S. l.], v. 39, n. 4, 1996. DOI: 10.4401/ag-4018. Disponível em: https://www.annalsofgeophysics.eu/index.php/annals/article/view/4018. Acesso em: 21 feb. 2024.