appell: Compute Appell's F1 hypergeometric function
This package wraps Fortran code by F. D. Colavecchia and G. Gasaneo for computing the Appell's F1 hypergeometric function. Their program uses Fortran code by L. F. Shampine and H. A. Watts. Moreover, the hypergeometric function with complex arguments is computed with Fortran code by N. L. J. Michel and M. V. Stoitsov or with Fortran code by R. C. Forrey. See the function documentations for the references and please cite them accordingly.