== Eksterne henvisninger ==
{{Commonskat|Coherers}}
*Web archive backup: "''[https://web.archive.org/web/20070927215716/http://home.luna.nl/~arjan-muil/radio/coherer.html The Coherer]''". World of Wireless, Virtual radiomuseum.
*"''[http://www.marconicalling.com/museum/html/objects/apparatus/objects-i=3.001-t=3-n=0.html Coherer / Receiver] {{Webarchive|url=https://web.archive.org/web/20041210045436/http://www.marconicalling.com/museum/html/objects/apparatus/objects-i=3.001-t=3-n=0.html |date=10. december 2004 }}''". Marconi Calling Company. 
*Slaby, Adolphus, "''[http://earlyradiohistory.us/1898sla.htm The New Telegraphy], Recent  experiments  in  telegraphy  with  sparks.''". The Century Magazine. April, 1898. (Earlyradiohistory.us)
* Hirakawa Institute of Technology(Japan),"''[http://www.hirakawaken.com/enewrc.html Coherer] {{Webarchive|url=https://web.archive.org/web/20160303220005/http://www.hirakawaken.com/enewrc.html |date= 3. marts 2016 }}''".
*"''[http://www.shareapic.net/347062-US-Patent-613809--Nikola-Tesla.html Tesla's US Patent: 613,809]''". ShareAPic.net.
Samfund Teknologi