Muhibul H. Bhuyan and  Mafujul Hasan,  Design and Simulation of Heartbeat Measurement System Using Arduino Microcontroller in Proteus.   journal   = {International Journal of Biomedical and Biological Engineering}, [online]. World Academy of Science, Engineering and Technology.
    September 2020, vol. 166(10). 350 - 357
    [viewed 27 April 2024]. Available from: https://publications.waset.org/pdf/10011538.