# Johannes Torbjørn Ubbink

> Ph.D. Universiteit Utrecht 1971

**Wikidata**: [Q102313596](https://www.wikidata.org/wiki/Q102313596)  
**Source**: https://4ort.xyz/entity/johannes-torbj-rn-ubbink


## References

1. Integrated Authority File
2. Mathematics Genealogy Project
3. Dutch National Thesaurus for Author Names