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Nielsen theory
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<h2 id="bibliography">Bibliography</h2> <ul><li><a href="/facts/Werner_Fenchel/UHLWzArw">Fenchel, Werner</a>; <a href="/facts/Jakob_Nielsen_(mathematician)/kkAvFr7f">Nielsen, Jakob</a> (2003). Asmus L. Schmidt (ed.). <i>Discontinuous groups of isometries in the hyperbolic plane</i>. De Gruyter Studies in mathematics. Vol. 29. Berlin: Walter de Gruyter & Co.</li></ul> <h2 id="external-links">External links</h2> <ul><li><a href="http://at.yorku.ca/t/a/i/c/39.htm">Survey article on Nielsen theory</a> by Robert F. Brown at Topology Atlas</li></ul>