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2. C. M. Bender and S. A. Orszag, Advanced Mathematical Methods for Scientists and Engineers, McGraw-Hill, New York, 1978.
3. H. Goldstein, Classical Mechanics, Addison-Wesley, Cambridge, 1950.
4. L. D. Landau and E. M. Lifshitz, Mechanics (transl, by J. B. Sykes and J. S. Bell), Addison-Wesley, Reading, 1960.