Study the Impact of the Distance Factor on the Optimal Workable Frequencies for the Long Distance Radio Communications. Iraqi Journal of Science, [S. l.], v. 56, n. 3B, p. 2392–2400, 2023. Disponível em: https://ijs.uobaghdad.edu.iq/index.php/eijs/article/view/9876.. Acesso em: 17 apr. 2025.