Nguyễn Minh Giảng, Tạ Hoài Nam. Method, algorithm, and calculation program for determining working frequencies of ionospheric radio links of shortwave transceivers. JMST [Internet]. 2022 Apr. 27 [cited 2024 Dec. 22];(78):68-77. Available from: https://online.jmst.info/index.php/jmst/article/view/247