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Rumiana Bojilova, Plamen Mukhtarov. AN EMPIRICAL MODEL FOR FORECASTING THE CRITICAL FREQUENCY OF THE IONOSPHERIC E-REGION OVER BULGARIA. SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 21st SGEM International Multidisciplinary Scientific GeoConference Proceedings 2021, Science and Technologies in Geology, Exploration And Mining, 2021, pp. 403-410. https://doi.org/10.5593/sgem2021/1.1/s05.075
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Rumiana Bojilova, Plamen Mukhtarov. AN EMPIRICAL MODEL FOR FORECASTING THE CRITICAL FREQUENCY OF THE IONOSPHERIC E-REGION OVER BULGARIA. SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 21st SGEM International Multidisciplinary Scientific GeoConference Proceedings 2021, Science and Technologies in Geology, Exploration And Mining, 2021, pp. 403-410. https://doi.org/10.5593/sgem2021/1.1/s05.075