# Kalle Väisälä

> Finnish mathematician and Esperantist (1893–1968)

**Wikidata**: [Q1399681](https://www.wikidata.org/wiki/Q1399681)  
**Source**: https://4ort.xyz/entity/kalle-v-is-l


## References

1. The National Biography of Finland
2. Mathematics Genealogy Project
3. Virtual International Authority File