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2. Akhiezer, A. I., , I. A., Akhiezer, , R. V., Polovin, , A. G., Sitenko, , K. N., Stepanov, , Collective Oscillations in a Plasma, Pergamon, New York, 1967,
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4. Artificial production of VLF hiss;Bell;J. Geophys. Res.,1968
5. Theory of plasma oscillations, B: Excitation and Damping of Oscillations;Bohm;Phys. Rev.,1949