The FORTRAN code can be downloaded here, or viewed directly here.
Copyright © 1988 - 2007 Mikhail Basko
The author hereby gives general permission to use and distribute
the source FORTRAN code, provided
that an appropriate acknowledgement of authorship is made and the URL
of the original document, i.e.
http://www.basko.net/mm/misc/guderley/ is mentioned.
Originally composed: 2007.02.04
Latest update: 2017.05.25