# “Underground Built Heritage”: A Theoretical Approach for the Definition of an International Class

> Research article (Heritage, 2021) · cited 31× · AI/ML

**Wikidata**: [openalex:W3175508883](https://www.wikidata.org/wiki/openalex:W3175508883)  
**Source**: https://4ort.xyz/entity/underground-built-heritage-a-theoretical-approach-for-the-definition-of-an-international-class