SILLENI, S. Coefficienti di portata delle stazioni radio. Annals of Geophysics, [S. l.], v. 10, n. 1-2, p. 145–159, 1957. DOI: 10.4401/ag-5887. Disponível em: https://www.annalsofgeophysics.eu/index.php/annals/article/view/5887. Acesso em: 31 may. 2026.