1. Uchida, H.: ‘Fundamentals of coupled lines and multiwire antennas’, (Research Institute of Electrical Communication, Tohoku University 1967), p. 291
2. Lin, C.-J.: ‘Short antenna with enhanced radiation or improved directivity’, (University Microfilms, Ann Arbor, Michigan 1969)
3. Modified transmission line antenna for personal handy phone
4. Stutzman, W.L., and Thiele, G.A.: ‘Antenna theory and design’, (Wiley, New York 1998), p. 175