The material in this chapter is partly derived from the STk Reference Manual written by Erick Gallesio, whose copyright notice is as follows.
Copyright © 1993-1999 Erick Gallesio - I3S-CNRS/ESSI <email@example.com> Permission to use, copy, modify, distribute,and license this software and its documentation for any purpose is hereby granted, provided that existing copyright notices are retained in all copies and that this notice is included verbatim in any distributions. No written agreement, license, or royalty fee is required for any of the authorized uses. This software is provided “AS IS” without express or implied warranty.
The material has been adapted for use in Guile, with the author’s permission.