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3. L. D. Landau and E. M. Lifshitz, The Classical Theory of Fields (Pergamon Press, Oxford, 1971).
4. B. A. Dubrovin, S. P. Novikov, and A. T. Fomenko, Modern Geomety. Methods and Applications (Springer, N.Y., 1984).
5. A. A. Vlasov, Statistical Distribution Functions (Nauka, M., 1966).