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== Enllaços externs ==
* [http://www.cartage.org.lb/en/themes/Sciences/Chemistry/Organicchemistry/StructuralFormulas/StructuralFormulas.htm The Importance of Structural Formulas (en inglés)] {{Webarchive|url=https://web.archive.org/web/20070328192557/http://www.cartage.org.lb/en/themes/Sciences/Chemistry/Organicchemistry/StructuralFormulas/StructuralFormulas.htm |date=2007-03-28
* [http://dl.clackamas.cc.or.us/ch106-01/strform.htm Structural formulas (en inglés)] {{Webarchive|url=https://web.archive.org/web/20090430102947/http://dl.clackamas.cc.or.us/ch106-01/strform.htm |date=2009-04-30
== Referències ==
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