Polushin, P. A. “Suppression of External Interferences and Spectral Distortion by Means of Simultaneous Separation of Signal and Interferences: Part 3. Suppression of a Selective Frequency Distortion of Spectrum of Signals”. Indian Science Cruiser 19, no. 2 (April 30, 2005): 24–28. Accessed May 16, 2024. http://www.informaticsjournals.com/index.php/ISC/article/view/42313.