Takaaki Ishibashi,  Blind Source Separation based on the Estimation for the Number of the Blind Sources under a Dynamic Acoustic Environment.   journal   = {International Journal of Electronics and Communication Engineering}, [online]. World Academy of Science, Engineering and Technology.
    September 2010, vol. 45(9). 1420 - 1425
    [viewed 17 January 2020]. Available from: https://publications.waset.org/pdf/13232.