# Berend Ferdinand Keulen
**Wikidata**: [Q21552000](https://www.wikidata.org/wiki/Q21552000)  
**Source**: https://4ort.xyz/entity/berend-ferdinand-keulen


## References

1. [Catalogus Professorum Academiae Groninganae](http://hoogleraren.ub.rug.nl/?page=showPerson&type=hoogleraar&hoogleraar_id=1365)
2. Catalogus Professorum Academiae Groninganae
3. [Source](https://viaf.org/viaf/data/viaf-20230206-links.txt.gz)
4. Virtual International Authority File