Jia Xin Low and  Keng Wah Choo,  Automatic Classification of Periodic Heart Sounds Using Convolutional Neural Network.   journal   = {International Journal of Electrical and Computer Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2018, vol. 133(1). 100 - 105
    [viewed 04 August 2020]. Available from: https://publications.waset.org/pdf/10008615.