Algorithm 743: WAPR: A Fortran Routine for Calculating Real Values of the W-Function. - D. A. Barry; S. J. Barry; P. J. Culligan-Hensley (ACM Trans. Math. Softw., 1995)

Real Values of the W-Function. - D. A. Barry; P. J. Culligan-Hensley; S. J. Barry (ACM Trans. Math. Softw., 1995)