“Choice of Maintaining the Resonant Mode Piezoelectric Transducer”. Visnyk NTUU KPI Seriia - Radiotekhnika Radioaparatobuduvannia, no. 43 (November 25, 2010): 60–64. Accessed March 14, 2025. https://radap.kpi.ua/radiotechnique/article/view/207.