# H. van Keulen
**Wikidata**: [Q112486532](https://www.wikidata.org/wiki/Q112486532)  
**Source**: https://4ort.xyz/entity/h-van-keulen


## References

1. Czech National Authority Database
2. [Source](https://viaf.org/viaf/data/viaf-20230206-links.txt.gz)