Sunitha. S.L. and  V. Udayashankara,  Fast Factored DCT-LMS Speech Enhancement for Performance Enhancement of Digital Hearing Aid.   journal   = {International Journal of Biomedical and Biological Engineering}, [online]. World Academy of Science, Engineering and Technology.
    October 2007, vol. 10(10). 559 - 563
    [viewed 05 June 2020]. Available from: https://publications.waset.org/pdf/2325.