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<h2 id="external-links">External links</h2> <ul><li><a href="http://www.wordwebonline.com/search.pl?w=cnumber"><i>WordWeb Online </i></a></li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>Nakahara, M (2003). Geometry, Topology, and Physics. CRC Press. p. 40. ISBN 0-7503-0606-8. <a href="0-7503-0606-8" target="_blank">0-7503-0606-8</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> </ol>