WASET
    Phruksaphanrat B.,  Multi-Objective Multi-Mode Resource-Constrained Project Scheduling Problem by Preemptive Fuzzy Goal Programming.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    February 2014, vol. 87(3). 601 - 605
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/9997781.