E. Koyuncu,  A Fuzzy Mathematical Model for Order Acceptance and Scheduling Problem.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    March 2017, vol. 124(4). 145 - 148
    [viewed 18 January 2022]. Available from: https://publications.waset.org/pdf/10006825.