# Ivan Popko
**Wikidata**: [Q12142371](https://www.wikidata.org/wiki/Q12142371)  
**Source**: https://4ort.xyz/entity/ivan-popko


## References

1. IdRef
2. Czech National Authority Database
3. Faceted Application of Subject Terminology
4. CERL Thesaurus
5. Virtual International Authority File
6. Integrated Authority File