IEEE Std. 437-1985 : IEEE Recommended practice for an electromagnetic site survey (10 KHz to 10 GHz) / IEEE [sponsored by the] Technical Committee 3 on Electromagnetic Environments of the IEEE Electromagnetic Compatibility Society
An efficient and accurate method for calculating and representing power density in the near-zone of microwave antennas : NBSIR report No. 85-3036 / Richard L. Lewis and Allen C. Newell