1. Magnus, W., andF. Oberhettinger: Formulas and Theorems for the Functions of Mathematical Physics, New York: Chelsea Publ. Co. 1949.
2. Titchmarsh, E. C.: The Theory of Functions, 2nd Ed. New York: Oxford Univ. Press 1939.
3. Watson, G. N.: A Treatise on the Theory of Bessel Functions, 2nd Ed. New York: Cambridge Univ. Press 1944.