1. Microwave Devices Based on Synchronized Oscillators, Ed. by N. N. Fomin (Radio i Svyaz’, Moscow, 1991) [in Russian].
2. A. A. El’chaninov, A. I. Klimov, O. B. Koval’chuk, et al., Tech. Phys. 56, 121 (2011).
3. V. Yu. Vvedenskii, A. V. Andriyanov, and E. A. Ermilov, Prib. Tekh. Eksp., No. 1, 114 (1975).
4. V. Yu. Vvedenskii, V. S. Syuvatkin, and A. A. Khrustalev, Radiotekh. Elektron. 30(10), 2063 (1985).
5. Yu. V. Konev, V. P. Gubanov, A. I. Klimov, et al., Instrum. Exp. Tech. 54, 781 (2011).