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2. G.E. Andrews, R. Askey, R. Roy, Special Functions (Cambridge University, Cambridge, 1999)
3. E. Artin, The Gamma Function (Translated by M Rinehart, and Winston Butler) (Holt, New York, 1964)
4. B.C. Carlson, Special Functions of Applied Mathematics (Academic, New York, 1977)
5. J.L. Challifour, Generalized Functions and Fourier Analysis: An Introduction (W. A. Benjamin, Reading, 1972)