Vinogradov, G. M., V. V. Smaglyuk, and K. V. Kolesnik. “Security Alarm Systems Based on Electromagnetic Flow of Microwave Signal and Phase-Forming Means”. Technology and Design in Electronic Equipment, no. 1, Feb. 2006, pp. 13-14, https://www.tkea.com.ua/index.php/journal/article/view/TKEA2006.1.13.