# Erwin Grueber
**Wikidata**: [Q74839540](https://www.wikidata.org/wiki/Q74839540)  
**Source**: https://4ort.xyz/entity/erwin-grueber


## References

1. Czech National Authority Database
2. Catalog of the German National Library
3. Virtual International Authority File
4. CiNii Research
5. CONOR.SI