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Dunckel, N, Helliwell RA.  1969.  Whistler-Mode Emissions on the OGO 1 Satellite. Journal of Geophysical Research. 74:6371-6385.
Helliwell, RA.  1963.  Whistler-Triggered Periodic Very-Low-Frequency Emissions. Journal of Geophysical Research. 68:5387.
Helliwell, RA, Carpenter DL.  1962.  Whistler-west results from the IGY-IGC-59 synoptic program. Trans. AGU. 43(1):125.
Helliwell, RA.  1965.  Whistlers and Related Ionospheric Phenomena.
Helliwell, RA.  1964.  Whistlers and VLF Emissions. Research in Geophysics, Volume 1: Sun, Upper Atmosphere, and Space. 1:319.
Helliwell, RA.  1968.  Whistlers and VLF Emissions. Physics of the Magnetosphere. 10:106.
Helliwell, RA, Carpenter DL.  1963.  Whistlers Excited by Nuclear Explosions. Journal of Geophysical Research. 68:4409.
Guthart, H.  1964.  Whistlers in a Thermal Magnetosphere.
Helliwell, RA.  1997.  Whistlers, Discovery of the Magnetosphere. History of Geophysics. 7:83-94.
Sonwalkar, VS, Helliwell RA, Inan US.  1990.  Wideband VLF electromagnetic bursts observed on the DE 1 satellite. Geophysical Research Letters. 17:1861-1864.