Wasim Orfali and  Hesham Tolba,  Assessment of the Occupancy’s Effect on Speech Intelligibility in Al-Madinah Holy Mosque.   journal   = {International Journal of Aerospace and Mechanical Engineering}, [online]. World Academy of Science, Engineering and Technology.
    August 2018, vol. 141(9). 877 - 881
    [viewed 18 May 2022]. Available from: https://publications.waset.org/pdf/10009482.