SIBANDA, P.; MCKINNELL, L.A. The applicability of existing topside ionospheric models to the South African region. South African Journal of Science, [S. l.], v. 105, n. 9/10, p. 387, 2010. Disponível em: https://sajs.co.za/article/view/10250. Acesso em: 6 may. 2024.