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<h2 id="references">References</h2> <ol> <li id="fn:1"><p>Scorpan, Alexandru (2005), The Wild World of 4-manifolds, American Mathematical Society, p. 560, ISBN 9780821837498. <a href="9780821837498" target="_blank">9780821837498</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> </ol>