SPALLA, P.; CAIROLO, L. TEC and f0F2 comparison. Annals of Geophysics, [S. l.], v. 37, n. 5, 1994. DOI: 10.4401/ag-4182. Disponível em: https://www.annalsofgeophysics.eu/index.php/annals/article/view/4182. Acesso em: 29 mar. 2024.