Analysis of pulse rate variability derived from photoplethysmography with the combination of lagged Poincar? plots and spectral characteristics.
Shi P, Zhu Y, Allen J, Hu S. Analysis of pulse rate variability derived from photoplethysmography with the combination of lagged Poincar? plots and spectral characteristics. Med Eng Phys. 2009 Sep; 31(7):866-71.