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Conference Paper
Helliwell, RA.  1970.  Intensity of Discrete VLF Emissions. Particles and Field in the Magnetosphere. 17:292.
Carlson, BE, Lehtinen NG, Inan US.  2010.  Observations of Terrestrial Gamma-Ray Flash Electrons. American Institute of Physics Conference Series. 1118:84-91.
Helliwell, RA.  1979.  Siple station experiments on wave-particle interactions in the magnetosphere. Wave instabilities in space plasmas; Proceedings of the Symposium, Helsinki, Finland, July 31-August 8, 1978. (A80-21196 07-46) Dordrecht, D. Reidel Publishing Co., 1979, p. 191-203.. :191-203.
Helliwell, RA.  1972.  The structure of the plasmasphere on the basis of indirect measurements.. The Upper Atmosphere: Part IV of Solar-Terrestrial Physics/1970. :165-175.
Helliwell, RA.  1983.  VLF wave injections from the ground. ESA Special Publication. 195:3-9.
Helliwell, RA, Walworth K  F.  1996.  Whistler mode wave intensities in the radiation belts. American Institute of Physics Conference Series. 383:61-64.
Park, CG.  1982.  Whistlers. CRC handbook of atmospherics. Volume 2 (A83-45876 22-42). Boca Raton, FL, CRC Press, Inc., 1982, p. 21-77.. 2:21-77.
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.
Conference Proceedings
[Anonymous].  1993.  Lightning-induced effects on VLF/LF radio propagation. AGARD, ELF/VLF/LF Radio Propagation and Systems Aspects 10 p (SEE N93-30727 11-32).
[Anonymous].  1978.  Modeling of VLF ducts in the plasmasphere. Operational Modelling of the Aerospace Propagation Environment, Volume 1. 1
[Anonymous].  1990.  Modification of the lower ionosphere in lightning-induced electron precipitation events and through VLF heating. AGARD, Ionospheric Modification and its Potential to Enhance or Degrade the Performance of Military Systems 12 p (SEE N91-18506 10-46).
[Anonymous].  1988.  A new global survey of ELF/VLF radio noise. AGARD, Effects of Electromagnetic Noise and Interference on Performance of Military Radio Communication Systems 15 p (SEE N89-18565 11-32).
Mlodnosky, R  F, Carpenter DL, Helliwell RA.  1962.  Non-thermal noise measurements near planets. Int'l Astrophys. Symp. on the physics of Planets. 24:220-223.
[Anonymous].  1969.  Plasma Waves in Space and in the Laboratory. Plasma Waves in Space and in the Laboratory.