# Stephan Grätzel

> German philosopher

**Wikidata**: [Q15849146](https://www.wikidata.org/wiki/Q15849146)  
**Source**: https://4ort.xyz/entity/stephan-gr-tzel


## References

1. BnF authorities
2. Integrated Authority File
3. Virtual International Authority File
4. Czech National Authority Database
5. MAK
6. Catalogue of the Library of the Pontifical University of the Holy Cross