Lossmann, E., M. A. Meister, and U. Madar. “Noise Level Estimation in the Shortwave Frequency Range”. Elektronika ir Elektrotechnika 112, no. 6 (June 8, 2011): 85-88. Accessed May 25, 2022. https://eejournal.ktu.lt/index.php/elt/article/view/454.