# Jan Friedrich Tönnies

> German physicist (1902-1970)

**Wikidata**: [Q1681780](https://www.wikidata.org/wiki/Q1681780)  
**Source**: https://4ort.xyz/entity/jan-friedrich-t-nnies


## References

1. Integrated Authority File
2. [Source](https://kalliope-verbund.info/DE-611-BF-111919)