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APA Citation
Guede-Fernández, F., Ferrer-Mileo, V., Mateu-Mateus, M., Ramos-Castro, J., García-González, M. Á., & Fernández-Chimeno, M. (2020). a photoplethysmography smartphone-based method for heart rate variability assessment: device model and breathing influences. Biomedical signal processing and control, 57, . http://access.bl.uk/ark:/81055/vdc_100099166330.0x00000c