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Helliwell, RA.  1983.  VLF wave injections from the ground. ESA Special Publication. 195:3-9.
Helliwell, RA.  1969.  Low-frequency waves in the magnetosphere.. Reviews of Geophysics and Space Physics. 7:281-303.
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.