1. Gray A, Mathews GB. A treatise on Bessel functions and their applications to physics. 2nd ed., prepared by A. Gray and T.M. MacRobert. London: Macmillan; 1922.
2. Whittaker ET, Watson GN. A course of modern analysis. 4th ed. Cambridge: Cambridge University Press; 1927.
3. Staff of the Bateman Manuscript Project. Higher transcendental functions. Vol. I and II. New York: McGraw-Hill; 1953; Vol. III. New York: McGraw-Hill; 1955.
4. Special Functions
5. Andrews GE, Askey R, Roy R. Special functions. Volume 71 of Encyclopedia of Mathematics and Its Applications. Cambridge: Cambridge University Press; 1999.