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3. H. S. Carslaw and J. C. Jaeger,Conduction of Head in Solids(Clarendon, Oxford, 1959).
4. P. Moon and D. E. Spencer,Field Theory for Engineers(Van Nostrand, New York, 1961).
5. I. M. Ryzyk and I. S. Gradsztejn,Tables of Integrals, Sums and Series(PWN, Warsaw, 1964).