Yue-Der Lin and  Wei-Ting Liu and  Ching-Che Tsai and  Wen-Hsiu Chen,  Coherence Analysis between Respiration and PPG Signal by Bivariate AR Model.   journal   = {International Journal of Electrical and Computer Engineering}, [online]. World Academy of Science, Engineering and Technology.
    May 2009, vol. 29(5). 1168 - 1173
    [viewed 23 April 2024]. Available from: https://publications.waset.org/pdf/1231.