Copyright (C) 2008 Haag, Rumori, Windisch, Zeller Permission is granted to copy, distribute and/or modify these documents under the terms of any of the: the GNU Free Documentation License, Version 1.2 or any later version published by the 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 "GNU Free Documentation License". These documents are distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Your fair use and other rights are not affected by the above.