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Burtis, W  J, Helliwell RA.  1975.  Magnetospheric chorus - Amplitude and growth rate. Journal of Geophysical Research. 80:3265-3270.
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Carpenter, DL, Helliwell RA.  1966.  Very-low-frequency phenomena. Antarctic Journal of U.S.. :193-194.
Chang, D  C  D, Helliwell RA.  1980.  VLF pulse propagation in the magnetosphere. IEEE Transactions on Antennas and Propagation. 28:170-176.
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