# Johan Gerretsen

> Dutch university teacher

**Wikidata**: [Q21033737](https://www.wikidata.org/wiki/Q21033737)  
**Source**: https://4ort.xyz/entity/johan-gerretsen


## References

1. Mathematics Genealogy Project
2. [Mathematics Genealogy Project](https://genealogy.math.ndsu.nodak.edu/id.php?id=115881)
3. Virtual International Authority File
4. National Library of Israel Names and Subjects Authority File
5. Catalogo of the National Library of India