WASET
    Chen Wu and  Youquan Xu and  Dandan Li and  Ronghua Yang and  Lijuan Wang,  An Improved Variable Tolerance RSM with a Proportion Threshold.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    June 2015, vol. 104(8). 2048 - 2056
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/10004968.