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2. Investigations on Lightning Discharges and on the Electric Fields of Thunderstorms;Appleton;Proc. R. Soc. London Ser. A,1920
3. The Measurement of Electric Field Intensity in Thunderclouds by Means of Radiosonde;Arabadzhi;Dokl. Akad. Nauk. SSSR,1956
4. The Approximate Mean Height of the Thudercloud Charge Taking Part in a Flash to Ground;Barnard;J. Geophys. Res.,1951
5. Electrical Screening Layers around Charged Clouds;Brown;J. Geophys. Res.,1971