1. Ball , L. E. L. Maxwell A. D. Watt The approximate magnetic fields near a horizontal electric dipole over a conducting medium, unpublished report Boulder, Colorado 1966
2. Electric and magnetic fields near a long horizontal line source above the ground;Bannister;Radio Sci.,1968
3. Bannister , P. R. The image theory quasi-static fields of antennas above the earth's surface New London, Connecticut. 1969
4. Burrows , M. L. Impedance data for the Sanguine transmitting antenna Bedford, Massachusetts. 1969
5. Wave propagation in overhead wires with ground return;Carson;Bell Syst. Tech. J.,1926