1. Ultra-Wideband Radar Technology, Ed. by J. D. Taylor (CRC, New York, 2000).
2. S. A. Shelkunoff, Electromagnetic Waves (D. Van Nostrand Company, New York, 1944).
3. N. V. Zernov, Theory of Wideband Near-Omnidirectional Ultrashort-Wave Antennas (Mozhaiskii LVVIA, Leningrad, 1958) [in Russian].
4. G. G. Goshin, Boundary Value Problems of Electromagnetics in Conical Domains (Tomsk. Univ., Tomsk, 1987) [in Russian].
5. Simulation of Small Superwideband Antennas, Ed. by V. B. Avdeev and A. V. Ashikhmin (Voronezh. Gos. Univ., Voronezh, 2005) [in Russian].