WASET
    Karam Y. Maalawi and  Hanan E.M EL-Sayed,  Stability Optimization of Functionally Graded Pipes Conveying Fluid.   journal   = {International Journal of Structural and Construction Engineering}, [online]. World Academy of Science, Engineering and Technology.
    July 2011, vol. 55(7). 1296 - 1301
    [viewed 19 April 2024]. Available from: https://publications.waset.org/pdf/2646.