1. V.K. Astashev, V.I. Babitsky, Ultrasonic Processes and Machines. Dynamics, Control and Applications, Springer, Berlin, 2007.
2. Vladimir N Khmelev, Roman V Barsukov, Alexey N Slivin, et a1, System of Phase-Locked-Loop Frequency Control of Ultrasonic Generators. The Second Siberian Russian Student Workshop EDM’01. 2001, (3-7), p. 56-57.
3. The Self-Action Agreement System of Electronic Generator with the Piezoelectric Oscillatory System Vladimir N. Khmelev, Roman V. Barsukov, Dmitry V. Genne, 8th International Siberian Workshop and Tutorials EDM’2007, Session V, July 1-5, Erlagol, p. 263-266.
4. Hui-juan Dong, Jian Wu, et al. An Improved Phase-Locked Loop Method for Automatic Resonance Frequency Tracing Based on Static Capacitance Broadband Compensation for a High-Power Ultrasonic Transducer. Ultrasonic Ferroelectrics and frequency control, vol.59.No.2. Feb. 2012, p. 205-210.
5. S. Voronina, V.I. Babitsky. Autoresonant control strategies of loaded ultrasonic transducer for machining applications. Journal of Sound and Vibration 313 (2008), p. 395-417.