# A qualitative classification of extraterrestrial civilizations

> Research article (Springer Link (Chiba Institute of Technology), 2020) · cited 13× · AI/ML

**Wikidata**: [openalex:W3105052410](https://www.wikidata.org/wiki/openalex:W3105052410)  
**Source**: https://4ort.xyz/entity/a-qualitative-classification-of-extraterrestrial-civilizations