# Using time causal quantifiers to characterize sleep stages

> Research article (Chaos Solitons & Fractals, 2021) · cited 30× · AI/ML

**Wikidata**: [openalex:W3139306563](https://www.wikidata.org/wiki/openalex:W3139306563)  
**Source**: https://4ort.xyz/entity/using-time-causal-quantifiers-to-characterize-sleep-stages