KOURIS, S. S.; SPALLA, P.; ZOLESI, B. Could ionospheric variations be precursors of a seismic event? A short discussion. Annals of Geophysics, [S. l.], v. 44, n. 2, 2001. DOI: 10.4401/ag-3605. Disponível em: https://www.annalsofgeophysics.eu/index.php/annals/article/view/3605. Acesso em: 20 oct. 2021.