WASET
    Masimuddin Mohd Khaled,  Analysis of Six Sigma in the Aerospace Industry.   journal   = {International Journal of Mechanical and Mechatronics Engineering}, [online]. World Academy of Science, Engineering and Technology.
    November 2013, vol. 84(12). 3072 - 3075
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/9996689.