# Emil Maria Claassen

> Dr. rer. pol. Universität zu Köln 1963

**Wikidata**: [Q56034320](https://www.wikidata.org/wiki/Q56034320)  
**Source**: https://4ort.xyz/entity/emil-maria-claassen


## References

1. Integrated Authority File
2. BnF authorities
3. Czech National Authority Database
4. Mathematics Genealogy Project
5. Catalog of the German National Library
6. [Source](https://dumas.ccsd.cnrs.fr/dumas-00807821/document)
7. Virtual International Authority File
8. Faceted Application of Subject Terminology
9. VIAF ID
10. NUKAT
11. Library of Congress Control Number
12. National Library of Israel Names and Subjects Authority File
13. Catalogo of the National Library of India