1. ‘Buried vertically polarized U.H.F. antennas’, research report, 8, Office of Telecommunications, ITS, Boulder, Colo., 1970
2. Schelkunoff, S.A.: Advanced antenna theory, (Van Nostrand p. 1952
3. Wait, J.R.: ‘Electromagnetic radiation from conical structures’, Collin, R.E., Zucker, F.J., Antenna theory, (McGraw-Hill 1969)