GUNASHEKAR, Salil D. et al. Utilization of antenna arrays in HF systems. Annals of Geophysics, [S. l.], v. 52, n. 3-4, p. 323–338, 2009. DOI: 10.4401/ag-4578. Disponível em: https://www.annalsofgeophysics.eu/index.php/annals/article/view/4578. Acesso em: 13 may. 2026.