Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.2
or any later version published by the
\href{http://www.fsf.org}{Free Software Foundation};
with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.
A copy of the license is included in the section entitled
``\hyperlink{GFDL_GFDL}{GNU Free Documentation License}''.