WASET
    M.I.S. Ismail and  Z. Taha,  Experimental Design and Performance Analysis in Plasma Arc Surface Hardening.   journal   = {International Journal of Materials and Metallurgical Engineering}, [online]. World Academy of Science, Engineering and Technology.
    August 2011, vol. 56(8). 722 - 728
    [viewed 29 March 2024]. Available from: https://publications.waset.org/pdf/31.