WASET
    Katsumi Hirata,  Estimating 3D-Position of A Stationary Random Acoustic Source Using Bispectral Analysis of 4-Point Detected Signals.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    June 2014, vol. 90(6). 939 - 942
    [viewed 29 March 2024]. Available from: https://publications.waset.org/pdf/9998599.