ZOLESI, Bruno. Ionospheric Physics and Radio Propagation over Europe: reports on national activities and cooperations. Quaderni di Geofisica, [S. l.], v. 15, 2001. Disponível em: https://collane-editoriali.ingv.it/index.php/qdg/article/view/1554. Acesso em: 23 oct. 2026.