# Pieter Coenraad Frederik Frowein

> Ph.D. Universiteit Leiden 1887

**Wikidata**: [Q102307492](https://www.wikidata.org/wiki/Q102307492)  
**Source**: https://4ort.xyz/entity/pieter-coenraad-frederik-frowein


## References

1. Mathematics Genealogy Project
2. Biographical lexicon of socialism and labor movement in the Netherlands
3. Biografisch Portaal