WASET
    Margaret F. Shipley,  Portfolio Management: A Fuzzy Set Based Approach to Monitoring Size to Maximize Return and Minimize Risk.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    April 2009, vol. 28(4). 1000 - 1007
    [viewed 09 May 2024]. Available from: https://publications.waset.org/pdf/9226.