Hamed Rafiei and  Masoud Rabbani,  Order Penetration Point Location using Fuzzy Quadratic Programming.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    October 2009, vol. 34(10). 2411 - 2414
    [viewed 18 October 2021]. Available from: https://publications.waset.org/pdf/3727.