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Бердник, С.Л., Васильковский, В.С., Катрич, В.А., Нестеренко, М.В. and Пенкин, Ю.М. 1. Spherical slot antenna with multi-element resonant diaphragm in the waveguide. Visnyk of V.N. Karazin Kharkiv National University, series “Radio Physics and Electronics”. 24 (1), 35-40.