WASET
    M. Yousaf and  S. Usman,  Effects of Roughness Elements on Heat Transfer during Natural Convection.   journal   = {International Journal of Chemical and Molecular Engineering}, [online]. World Academy of Science, Engineering and Technology.
    September 2015, vol. 107(11). 1287 - 1292
    [viewed 20 April 2024]. Available from: https://publications.waset.org/pdf/10002713.