4.2.12 Utlaut, W.F., Ionospheric Modification Induced by High-Powered HF Transmitters: /I Potential for Extended Range VHF-UHF Communications and Plasma Physics Research, Proc, of the IEEE, 63, 1022 (1975). 4.2.13 Duncan, L.M., Preliminary Results of Arecibo Thermal Runaway Experiment , Los Alamos Scientific Laboratory (July 12, 1978). 4.2.14 Rush, C.M., Institute for Telecommunication Sciences, Report on Aug. 28-31, Meeting of SPS Ionospheric Working Group (draft), Sept. 8, 1978.
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