# Niels Nielsen

> Danish mathematician (1865 – 1931)

**Wikidata**: [Q1989014](https://www.wikidata.org/wiki/Q1989014)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Niels_Nielsen_(mathematician))  
**Source**: https://4ort.xyz/entity/niels-nielsen


## References

1. Integrated Authority File
2. [Dansk Biografisk Leksikon, 3rd edition](https://biografiskleksikon.lex.dk/Niels_Nielsen_-_matematiker)
3. BnF authorities
4. Czech National Authority Database
5. Mathematics Genealogy Project
6. Virtual International Authority File
7. CiNii Research
8. Wikimedia Commons
9. MacTutor History of Mathematics archive
10. Dansk Biografisk Leksikon
11. Freebase Data Dumps. 2013
12. LIBRIS. 2012
13. National Library of Israel Names and Subjects Authority File