Nguyễn Minh Giảng, and Tạ Hoài Nam. “Method, Algorithm, and Calculation Program for Determining Working Frequencies of Ionospheric Radio Links of Shortwave Transceivers”. Journal of Military Science and Technology, no. 78 (April 27, 2022): 68–77. Accessed December 22, 2024. https://online.jmst.info/index.php/jmst/article/view/247.