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Helliwell, RA.  1983.  VLF wave injections from the ground. ESA Special Publication. 195:3-9.
Chang, D  C  D, Helliwell RA.  1980.  VLF pulse propagation in the magnetosphere. IEEE Transactions on Antennas and Propagation. 28:170-176.
Carpenter, DL, Helliwell RA.  1966.  Very-low-frequency phenomena. Antarctic Journal of U.S.. :193-194.
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