Meier, Manuel, and Christian Holz. “Impact of Optical Wavelength on the Reliability of Photoplethysmography-Based Heart Rate Measurements Outside of Controlled Laboratory Environments”. Current Issues in Sport Science (CISS) 9, no. 2 (February 6, 2024): 060. Accessed May 9, 2024. https://ciss-journal.org/article/view/10900.