IPPOLITO, A. foF2 variations measured by the Rome observatory during solar minimum in the last three solar cycles. Annals of Geophysics, [S. l.], v. 62, n. 4, p. GM452, 2019. DOI: 10.4401/ag-7762. Disponível em: https://www.annalsofgeophysics.eu/index.php/annals/article/view/7762. Acesso em: 4 aug. 2021.