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APA Citation
de Rezende Barbosa, M. P. d. C., Silva, N. T. d., de Azevedo, F. M., Pastre, C. M., & Vanderlei, L. C. M. (n.d.). comparison of Polar® RS800G3™ heart rate monitor with Polar® S810i™ and electrocardiogram to obtain the series of RR intervals and analysis of heart rate variability at rest. Clinical physiology and functional imaging, 36, 112–117. http://access.bl.uk/ark:/81055/vdc_100028782331.0x000001