Prokopenko, I. G., I. P. Omelchuk, Yu. D. Chyrka, and V. Yu. Vovk. “Fast Frequency Tracking”. Technology and design in electronic equipment, no. 6 (December 19, 2013): 25-31. Accessed September 16, 2025. http://www.tkea.com.ua/index.php/journal/article/view/TKEA2013.6.25.