# A photoplethysmography smartphone-based method for heart rate variability assessment: device model and breathing influences

> Research article (Biomedical Signal Processing and Control, 2019) · cited 23× · AI/ML

**Wikidata**: [openalex:W2983424995](https://www.wikidata.org/wiki/openalex:W2983424995)  
**Source**: https://4ort.xyz/entity/a-photoplethysmography-smartphone-based-method-for-heart-rate-variability-assessment-device-model-and-breathing-influenc