S. Fujiwara and  T. Kaburagi and  K. Kobayashi and  K. Watanabe and  Y. Kurihara,  Evaluation Using a Bidirectional Microphone as a Pressure Pulse Wave Meter.   journal   = {International Journal of Health and Medical Engineering}, [online]. World Academy of Science, Engineering and Technology.
    July 2015, vol. 104(8). 806 - 811
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/10002019.