Ponomarev, V. A., and O. V. Ponomareva. “The Invariance of Current Energy Fourier Spectrum of Discrete Real Signals on Finite Intervals”. Technology and design in electronic equipment, no. 1 (February 25, 2014): 15-22. Accessed September 16, 2025. http://www.tkea.com.ua/index.php/journal/article/view/TKEA2014.1.15.