# Piotr Grzegorczyk
**Wikidata**: [Q110176803](https://www.wikidata.org/wiki/Q110176803)  
**Source**: https://4ort.xyz/entity/piotr-grzegorczyk


## References

1. Integrated Authority File
2. NUKAT
3. SHARE Catalogue
4. MAK
5. Czech National Authority Database
6. National Library of Israel Names and Subjects Authority File