Abdulnasir Hossen and  Ulrich Heute,  The Wavelet-Based DFT: A New Interpretation, Extensions and Applications.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    October 2007, vol. 10(10). 3325 - 3329
    [viewed 23 October 2019]. Available from: https://publications.waset.org/pdf/6859.