“High-Q Spherical Dielectric Resonator Oscillations in the Optical and Infrared Ranges”. Visnyk NTUU KPI Seriia - Radiotekhnika Radioaparatobuduvannia, no. 33 (September 25, 2006): 83–91. Accessed January 27, 2026. https://radap.kpi.ua/radiotechnique/article/view/455.