Debabrata Das and  Pankaj Dutta,  A Simulation Study of Bullwhip Effect in a Closed-Loop Supply Chain with Fuzzy Demand and Fuzzy Collection Rate under Possibility Constraints.   journal   = {International Journal of Industrial and Manufacturing Engineering}, [online]. World Academy of Science, Engineering and Technology.
    April 2012, vol. 64(4). 466 - 473
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/4496.