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2. J. C. Maxwell, A Treatise on Electricity and Magnetism, Oxford University Press (1873).
3. V. G. Levich, A Course in Theoretical Physics, Vol. 1 [in Russian], Nauka, Moscow (1969).
4. L. D. Landau and E. M. Lifshits, Electrodynamics of Continuous Media [in Russian], Gostekhizdat, Moscow (1957).
5. F. R. Gantmakher, Lectures in Analytical Mechanics [in Russian], Nauka, Moscow (1966).