# Stefan Grzegorczyk
**Wikidata**: [Q48849455](https://www.wikidata.org/wiki/Q48849455)  
**Source**: https://4ort.xyz/entity/stefan-grzegorczyk


## References

1. [Source](https://viaf.org/viaf/data/viaf-20230206-links.txt.gz)
2. Czech National Authority Database
3. MAK
4. Virtual International Authority File