# Ján Olejník
**Wikidata**: [Q20493220](https://www.wikidata.org/wiki/Q20493220)  
**Source**: https://4ort.xyz/entity/j-n-olejn-k


## References

1. Czech National Authority Database
2. [Records of persons of interest](http://svazky.cz/test/svazkyMT.php?jmeno=Jan&prijm=Olejnik&dnar=10.05.1921&hledej=Hledat)
3. [Source](https://viaf.org/viaf/data/viaf-20230206-links.txt.gz)
4. Library of Congress Name Authority File
5. Virtual International Authority File
6. [Source](http://svazky.cz/test/svazkyMT.php?jmeno=Jan&prijm=Olejnik&dnar=10.05.1921&hledej=Hledat)
7. Bibliography of the History of the Czech Lands