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<h2 id="references">References</h2> <ol> <li id="fn:1"><p>"Archived copy" (PDF). Archived from the original (PDF) on 2007-06-14. Retrieved 2007-07-12.{{cite web}}: CS1 maint: archived copy as title (link) <a href="https://web.archive.org/web/20070614054303/http://escher.elis.ugent.be/publ/Edocs/DOC/P105_234.pdf" target="_blank">https://web.archive.org/web/20070614054303/http://escher.elis.ugent.be/publ/Edocs/DOC/P105_234.pdf</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> </ol>