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Journal Article
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.
Dunckel, N, Helliwell RA.  1969.  Whistler-Mode Emissions on the OGO 1 Satellite. Journal of Geophysical Research. 74:6371-6385.