References
- Jordan , E. C. 1958 . Electromagnetic Waves and Radiating Systems 320 and 458 – 460 . Prentice-Hall
- Kraus , J. D. 1988 . Antennas , 2nd edition , 225 – 227 . McGraw-Hill .
- Balanis , C. A. 1997 . Antenna Theory , 2nd edition , 893 – 898 . Wiley .
- Cheng , D. K. 1992 . Field and Wave Electromagnetics , 2nd edition , Addison-Wesley . Chapter 11