WASET
    Nur Ilyani Ramli and  Mansour Youseffi and  Peter Widdop,  Design and Fabrication of a Low Cost Heart Monitor using Reflectance Photoplethysmogram.   journal   = {International Journal of Biomedical and Biological Engineering}, [online]. World Academy of Science, Engineering and Technology.
    August 2011, vol. 56(8). 307 - 316
    [viewed 24 April 2024]. Available from: https://publications.waset.org/pdf/3628.