# Johannes Martinus Hasselaar

> Dutch university teacher (1917-1992)

**Wikidata**: [Q63003471](https://www.wikidata.org/wiki/Q63003471)  
**Source**: https://4ort.xyz/entity/johannes-martinus-hasselaar


## References

1. Catalogus Professorum Academiae Rheno-Traiectinae
2. Czech National Authority Database
3. [Source](https://viaf.org/viaf/data/viaf-20230206-links.txt.gz)
4. Biografisch Portaal
5. [Czech National Authority Database](https://www.nkp.cz/o-knihovne/odborne-cinnosti/otevrena-data)
6. Virtual International Authority File