# External factors that affect the photoplethysmography waveforms

> Research article (SN Applied Sciences, 2021) · cited 20× · AI/ML

**Wikidata**: [openalex:W3192792544](https://www.wikidata.org/wiki/openalex:W3192792544)  
**Source**: https://4ort.xyz/entity/external-factors-that-affect-the-photoplethysmography-waveforms