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Brice, NM.  1964.  Discrete VLF Emissions from the Upper Atmosphere.
Cousins, MD.  1972.  Direction Finding on Whistlers and Related VLF Signals.
Imhof, W  L, Reagan J  B, Voss H  D, Gaines E  E, Datlowe D  W, Mobilia J, Helliwell RA, Inan US, Katsufrakis J  P, Joiner R  G.  1983.  Direct observation of radiation belt electrons precipitated by the controlled injection of VLF signals from a ground-based transmitter. Geophysical Research Letters. 10:361-364.
Sonwalkar, VS, Bell TF, Helliwell RA, Inan US.  1984.  Direct multiple path magnetospheric propagation - A fundamental property of nonducted VLF waves. Journal of Geophysical Research. 89:2823-2830.
Stiles, GS.  1974.  Digital Spectra of Artificially Stimulated VLF Emissions.
Inan, US, Helliwell RA.  1982.  DE-1 observations of VLF transmitter signals and wave-particle interactions in the magnetosphere. Geophysical Research Letters. 9:917-920.
Bell, TF, Inan US, Sonwalkar VS, Helliwell RA.  1991.  DE-1 observations of lower hybrid waves excited by VLF whistler mode waves. Geophysical Research Letters. 18:393-396.
Bell, TF, Inan US, Lauben D S, Sonwalkar VS, Helliwell RA, Sobolev Y  P, Chmyrev V  M, Gonzalez S.  1994.  DE-1 and COSMOS 1809 observations of lower hybrid waves excited by VLF whistler mode waves. Geophysical Research Letters. 21:653-656.
Sonwalkar, VS, Inan US, Bell TF, Helliwell RA, Molchanov O  A, Green JL.  1994.  DE 1 VLF observations during Activny wave injection experiments. Journal of Geophysical Research. 99:6173-6189.
Rastani, K, Inan US, Helliwell RA.  1985.  DE 1 observations of Siple transmitter signals and associated sidebands. Journal of Geophysical Research. 90:4128-4140.
Mlodnosky, R  F, Helliwell RA, Rorden L  H.  1965.  Daytime Whistler-Mode Attenuation through the Lower Ionosphere at 15.5 Kc as Measured on Explorer VI during Launch Trajectory. NASA Special Publication. 54:91.
C
Chang, H-chun.  1983.  Cyclotron Resonant Scattering of Energetic Electrons by Electromagnetic Waves in the Magnetosphere.
Helliwell, RA.  1963.  Coupling between the ionosphere and the earth-ionosphere waveguide at very low frequencies. The Ionosphere. :452.
Helliwell, RA, Doolittle J  H, Armstrong W  C, Carpenter DL, Mende SB.  1980.  Correlation between lambda 4278 optical emissions and VLF wave events observed at L approximately 4 in the Antarctic. Journal of Geophysical Research. 85:3376-3386.
Carlson, C R., Helliwell RA, Carpenter DL.  1985.  Correction to ``Variable Frequency VLF Signals in the Magnetosphere: Associated Phenomena and Plasma Diagnostics''. Journal of Geophysical Research. 90(A7):6689-6689.
Helliwell, RA, Katsufrakis J  P.  1978.  Controlled wave-particle interaction experiments, Paper 5 in Upper Atmosphere Research in Antarctica. Upper Atmosphere Research in Antarctica. 29:100-129.
Helliwell, RA.  1974.  Controlled VLF Wave Injection Experiments in the Magnetosphere. Space Science Reviews. 15:781-802.
Helliwell, RA.  1983.  Controlled stimulation of VLF emissions from Siple Station, Antarctica. Radio Science. 18:801-814.
Luette, J  P, Park CG, Helliwell RA.  1979.  The control of the magnetosphere by power line radiation. Journal of Geophysical Research. 84:2657-2660.
Rosenberg, TJ, Siren J  C, Matthews D  L, Marthinsen K, Holtet J  A, Egeland A, Carpenter DL, Helliwell RA.  1981.  Conjugacy of electron microbursts and VLF chorus. Journal of Geophysical Research. 86:5819-5832.
Inan, US, Bell TF, Helliwell RA.  1977.  Coherent wave induced particle precipitation into the upper atmosphere. NATO ASIC Proc. 35: Dynamical and Chemical Coupling Between the Neutral and Ionized Atmosphere. :169-174.
Helliwell, RA.  1975.  Coherent VLF waves in the magnetosphere. Royal Society of London Philosophical Transactions Series A. 280:137-149.
Lefeuvre, F, Helliwell RA.  1985.  Characterization of the sources of VLF hiss and chorus observed on Geos 1. Journal of Geophysical Research. 90:6419-6438.
Gail, W  B, Inan US, Helliwell RA, Carpenter DL, Krishnaswamy S.  1990.  Characteristics of wave-particle interactions during sudden commencements. I - Ground-based observations. Journal of Geophysical Research. 95:119-137.
B
Dingle, B K.  1977.  Burst Precipitation of Energetic Electrons from the Magnetosphere.