Nadia Masood Khan and  Muhammad Salman Khan and  Gul Muhammad Khan,  Automated Heart Sound Classification from Unsegmented Phonocardiogram Signals Using Time Frequency Features.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    June 2018, vol. 140(8). 598 - 603
    [viewed 10 December 2019]. Available from: https://publications.waset.org/pdf/10009310.