The plasmapause as a VLF wave guide

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Inan, US, Bell TF.  1977.  The plasmapause as a VLF wave guide. Journal of Geophysical Research. 82:2819-2827.

Coherent VLF waves in the magnetosphere

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Helliwell, RA.  1975.  Coherent VLF waves in the magnetosphere. Royal Society of London Philosophical Transactions Series A. 280:137-149.