Krival, I. I., Skrypnyuk, A. I., Protsenko, V. A. and Marjenko, A. V. (2009) “Small size digital frequency counters of high-frequency range”, Technology and design in electronic equipment, (5), pp. 54-57. Available at: https://www.tkea.com.ua/index.php/journal/article/view/TKEA2009.5.54 (Accessed: 2December2025).