== Eksterne henvisninger ==
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* [http://www.kirjasto.sci.fi/cassir.htm Books and Writers] {{Webarchive|url=https://web.archive.org/web/20070703175504/http://www.kirjasto.sci.fi/cassir.htm |date= 3. juli 2007 }}
* http://www.warburg-haus.hamburg.de/eca/index.html {{Webarchive|url=https://web.archive.org/web/20041009182356/http://www.warburg-haus.hamburg.de/eca/index.html |date= 9. oktober 2004 }}
* http://www.helmut-zenz.de/hzcassir.html {{Webarchive|url=https://web.archive.org/web/20041009124949/http://www.helmut-zenz.de/hzcassir.html |date= 9. oktober 2004 }}
* http://www.bautz.de/bbkl/c/cassirer_e.shtml {{Webarchive|url=https://web.archive.org/web/20090104183744/http://www.bautz.de/bbkl/c/cassirer_e.shtml |date= 4. januar 2009 }}
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