H. Maalem and  F. Marir,  Trispectral Analysis of Voiced Sounds Defective Audition and Tracheotomisian Cases.   journal   = {International Journal of Electronics and Communication Engineering}, [online]. World Academy of Science, Engineering and Technology.
    September 2007, vol. 9(9). 1396 - 1400
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/5303.