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A very nice representation of the general relationships to natural / artificial, electromagnetic radiation and EMVU: "invisible environment" (1986), Prof.Dr.em. * Herbert L. König. "Invisible environment", the classic from university research work, as well as former teaching material at the Technical University Munich. To buy or purchase please go to the Michaelsverlag.de.
The continuation of this basic research can be found in my German book "Nature needs chaos".