Determination of the Annual Optimal Reliable Frequency for Different Transmitter/Receiver Stations Distributed over the Iraqi Territory. Iraqi Journal of Science, [S. l.], v. 62, n. 4, p. 1386–1395, 2021. DOI: 10.24996/ijs.2021.62.4.34. Disponível em: https://www.ijs.uobaghdad.edu.iq/index.php/eijs/article/view/2725.. Acesso em: 3 aug. 2025.