“Dual- And Multiband Horns of Feed Systems for Reflector-Type Antennas”. Visnyk NTUU KPI Seriia - Radiotekhnika Radioaparatobuduvannia, no. 38 (March 30, 2009): 130–147. Accessed May 9, 2025. https://radap.kpi.ua/radiotechnique/article/view/183.