Ahmad Tariq Sheikh and  Shahzad Amin Sheikh,  Efficient Variants of Square Contour Algorithm for Blind Equalization of QAM Signals.   journal   = {International Journal of Electronics and Communication Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2009, vol. 27(3). 448 - 456
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/5266.