# Hermann Gülfferich
**Wikidata**: [Q94792417](https://www.wikidata.org/wiki/Q94792417)  
**Source**: https://4ort.xyz/entity/hermann-g-lfferich


## References

1. Catalog of the German National Library
2. Integrated Authority File
3. Czech National Authority Database
4. Virtual International Authority File
5. FactGrid