* Wolfram gamma function evaluator (arbitrary precision)* Volume of n-Spheres and the Gamma Function at MathPages* "Selected Transformations, Identities, and Special Values for the Gamma Function"
* Wolfram gamma function evaluator (arbitrary precision)* Volume of n-Spheres and the Gamma Function at MathPages* "Selected Transformations, Identities, and Special Values for the Gamma Function"