ZOLESI, B.; CANDER, L. R. Advances in regional ionospheric mapping over europe. Annals of Geophysics, [S. l.], v. 41, n. 5-6, 1998. DOI: 10.4401/ag-3823. Disponível em: https://www.annalsofgeophysics.eu/index.php/annals/article/view/3823. Acesso em: 29 mar. 2024.