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3. R. P. Feynman, R. B. Leighton, and M. Sands, The Feynman Lectures on Physics, V.2 (Addison-Wesley publishing company, Inc. Reading, Massachusetts, Paolo Alto, London, 1964).
4. Handbook of atmospheric electrodynamics, Vol. 1, Ed. by H. Volland (CRC Press, Boca Raton, London, Tokyo, 1995).