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Most of this document is a quotation of other peoples work. Where possible and allowed we tried to copy their work literally. On some occasions we had to alter the texts to fit their new context. We tried to give proper credit to the original authors and have included pointers to the original texts in the bibliography. While every precaution was made in the preparation of this book, we can assume no responsibility for errors or omissions. When you feel we have not given you proper credit, when you feel we may have violated your rights, or when you have suggestions how we may improve our work, please notify us immediately, so we can take corrective actions.
Copyright © 2001 Henk Klöpping. 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".