Фесіч, В. “Direct Digital Synthesis (dds) in Control Systems Ultrasonic Resonance Actuators”. Visnyk NTUU KPI Seriia - Radiotekhnika Radioaparatobuduvannia, no. 48, Feb. 2012, pp. 134-9, doi:10.20535/RADAP.2012.48.134-139.