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<h2 id="see-also">See also</h2> <ul><li><a href="/facts/Singular_point_of_a_curve/mGFKPaas">Singular point of a curve</a></li> <li><a href="/facts/Crunode/xysf5ckp">Crunode</a></li> <li><a href="/facts/Cusp_(singularity)/QH3fEGry">Cusp</a></li> <li><a href="/facts/Tacnode/C5M8xmmQ">Tacnode</a></li></ul> <ul><li>Porteous, Ian (1994). <a href="https://archive.org/details/geometricdiffere0000port"><i>Geometric Differentiation</i></a>. <a href="/facts/Cambridge_University_Press/fgEBSSRq">Cambridge University Press</a>. p. 47. <a href="/facts/ISBN_(identifier)/15AdSPa9">ISBN</a> 978-0-521-39063-7.</li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>Hazewinkel, M. (2001) [1994], "Acnode", Encyclopedia of Mathematics, EMS Press <a href="https://www.encyclopediaofmath.org/index.php?title=Acnode&oldid=15498" target="_blank">https://www.encyclopediaofmath.org/index.php?title=Acnode&oldid=15498</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> </ol>