Joshua Prakash and  Chin Jeng Feng,  Variation of CONWIP Systems.   journal   = {International Journal of Mechanical and Mechatronics Engineering}, [online]. World Academy of Science, Engineering and Technology.
    December 2012, vol. 72(12). 2765 - 2769
    [viewed 28 January 2022]. Available from: https://publications.waset.org/pdf/6748.