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<h2 id="references">References</h2> <ol> <li id="fn:1"><p>Locher, J.L. (2000). The Magic of M. C. Escher. Harry N. Abrams, Inc. ISBN 0-8109-6720-0 <a href="/wiki/Harry_N._Abrams,_Inc." target="_blank">/wiki/Harry_N._Abrams,_Inc.</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> </ol>