# Karel Otakar Čech
**Wikidata**: [Q95182893](https://www.wikidata.org/wiki/Q95182893)  
**Source**: https://4ort.xyz/entity/karel-otakar-ech


## References

1. Czech National Authority Database
2. Virtual International Authority File
3. Croatian Encyclopedia
4. Proleksis Encyclopedia
5. Croatian Biographical Lexicon
6. Biographies of the Entomologists of the World