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Normal surface
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<h2 id="further-reading">Further reading</h2> <ul><li><a href="/facts/Joel_Hass/9bxWBFNx">Hass, Joel</a> (July 2012), <i>What is an almost normal surface?</i>, <a href="/facts/ArXiv_(identifier)/H6EtgnBe">arXiv</a>:<a href="https://arxiv.org/abs/1208.0568">1208.0568</a>, <a href="/facts/Bibcode_(identifier)/9HtdQSGB">Bibcode</a>:<a href="https://ui.adsabs.harvard.edu/abs/2012arXiv1208.0568H">2012arXiv1208.0568H</a></li> <li>Tillmann, Stephan (2008), <i>Normal surfaces in topologically finite 3-manifolds</i>, <a href="/facts/ArXiv_(identifier)/H6EtgnBe">arXiv</a>:<a href="https://arxiv.org/abs/math/0406271">math/0406271</a>, <a href="/facts/Bibcode_(identifier)/9HtdQSGB">Bibcode</a>:<a href="https://ui.adsabs.harvard.edu/abs/2004math......6271T">2004math......6271T</a></li></ul>