The following holds for all original content available from this site ( and created by Josť Manuel Cerqueira Esteves, except for any content for which a different license is specified. Any documents by other authors are provided according to the terms of their respective licenses.

Copyright (c) 2001 Josť Manuel Cerqueira Esteves.

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.1 or any later version published by the Free Software Foundation; with no Invariant Sections, with no Front-Cover Texts, and with no Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free Documentation License".