# RETRACTED ARTICLE: Automatic sleep staging in obstructive sleep apnea patients using photoplethysmography, heart rate variability signal and machine learning techniques

> Research article (Neural Computing and Applications, 2016) · cited 106× · AI/ML

**Wikidata**: [openalex:W2410151604](https://www.wikidata.org/wiki/openalex:W2410151604)  
**Source**: https://4ort.xyz/entity/retracted-article-automatic-sleep-staging-in-obstructive-sleep-apnea-patients-using-photoplethysmography-heart-rate-vari