# Sergeĭ Efimovich Kri︠u︡chkov
**Wikidata**: [Q111586215](https://www.wikidata.org/wiki/Q111586215)  
**Source**: https://4ort.xyz/entity/serge-efimovich-kri-u-chkov


## References

1. IdRef
2. Czech National Authority Database
3. [Source](https://viaf.org/viaf/data/viaf-20230206-links.txt.gz)
4. Great Soviet Encyclopedia (1969–1978)
5. Pedagogues and Psychologists of the World