Gamma Function; Gamma Function for Range 1 to
2; Reciprocal Gamma Function to Real Argument; 
Gamma Function; Logarithm of Gamma Function (Algorithms
34[S14]; 54[S14]; 80[S14]; 221[S14]; 291[S14])
CACM September, 1966
Pike, M. C.
Hill, I. D.
