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2. IGY whistler results;Allcock,1960
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4. Whistler duct properties deduced from VLF observations made with the Ogo 3 satellite near the magnetic equator;Angerami;J. Geophys. Res.,1970
5. Characteristics of small dispersion whistlers observed at middle latitudes;Araki;Rep. lonos. Space Res. Jap.,1969