# Erich Martensen
**Wikidata**: [Q28869771](https://www.wikidata.org/wiki/Q28869771)  
**Source**: https://4ort.xyz/entity/erich-martensen


## References

1. [BnF authorities](https://catalogue.bnf.fr/ark:/12148/cb16561415g)
2. Mathematics Genealogy Project
3. Czech National Authority Database
4. general catalog of BnF
5. Virtual International Authority File
6. CiNii Research
7. BnF authorities
8. National Library of Israel Names and Subjects Authority File