# Ivan Kovalchenko

> Russian scientist

**Wikidata**: [Q4225527](https://www.wikidata.org/wiki/Q4225527)  
**Source**: https://4ort.xyz/entity/ivan-kovalchenko


## References

1. Virtual International Authority File
2. Great Soviet Encyclopedia (1969–1978)
3. [LIBRIS. 2012](https://libris.kb.se/katalogisering/jgvz2gg25lcxzc9)
4. National Library of Israel Names and Subjects Authority File
5. Bibliography of the History of the Czech Lands