# Jacob Willem Langelaan
**Wikidata**: [Q65851787](https://www.wikidata.org/wiki/Q65851787)  
**Source**: https://4ort.xyz/entity/jacob-willem-langelaan


## References

1. Leidse Hoogleraren
2. Mathematics Genealogy Project
3. Virtual International Authority File
4. Album Academicum
5. Biografisch Portaal
6. Base biographique