books.google.com - The late Professor G.N. Watson wrote his monumental treatise on the theory of Bessel functions in 1922 with two objects in view. The first was the development of applications of the fundamental processes of the theory of complex variables, and the second was compiling a collection of results of value...http://books.google.com/books/about/A_Treatise_on_the_Theory_of_Bessel_Funct.html?id=Mlk3FrNoEVoC&utm_source=gb-gplus-shareA Treatise on the Theory of Bessel Functions
