# Q20733794
**Wikidata**: [Q20733794](https://www.wikidata.org/wiki/Q20733794)  
**Source**: https://4ort.xyz/entity/q20733794


## References

1. Integrated Authority File
2. Catalogus Professorum Halensis
3. Virtual International Authority File
4. [Source](https://mobile.cmistar.ch/webclients/uzh/#/content/e46cee546f744491b72c95ce3128dd38)
5. [Source](http://www.catalogus-professorum-halensis.de/jahnwilhelm.html)
6. National Library of Israel Names and Subjects Authority File