# Reports from Twin Earth: Both deep structure and appearance determine the reference of natural kind terms

> Research article (Mind & Language, 2020) · cited 42× · AI/ML

**Wikidata**: [openalex:W3007612267](https://www.wikidata.org/wiki/openalex:W3007612267)  
**Source**: https://4ort.xyz/entity/reports-from-twin-earth-both-deep-structure-and-appearance-determine-the-reference-of-natural-kind-terms