== Eksterne henvisninger ==
{{commonskat|Crystal resonator}}
* [https://web.archive.org/web/20120111154805/http://www.scapro.se/text/jauchkristallara.pdf scapro.se: Quartz Crystal Theory (pdf)]
* {{Dmoz|Recreation/Radio/Amateur/Boatanchors/Crystals}}
* [http://www.vhfcomm.co.uk/ VHF Communications Magazine]
** [https://web.archive.org/web/20120316021249/http://www.vhfcomm.co.uk/pdf/Pressworks%20-%20VCXO.pdf Bern Neubig, DK1AG. VCXO's with wide pull-in range using alternatives to quartz (pdf)] Citat: "...but no material has been found to date that can really replace quartz..."
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Musik Fysik Teknologi