# A Multi-Class Automatic Sleep Staging Method Based on Photoplethysmography Signals

> Research article (Entropy, 2021) · cited 33× · AI/ML

**Wikidata**: [openalex:W3124849971](https://www.wikidata.org/wiki/openalex:W3124849971)  
**Source**: https://4ort.xyz/entity/a-multi-class-automatic-sleep-staging-method-based-on-photoplethysmography-signals