WASET
    Yanshuang Zhang and  Byungho Jeong,  A Super-Efficiency Model for Evaluating Efficiency in the Presence of Time Lag Effect.   journal   = {International Journal of Industrial and Manufacturing Engineering}, [online]. World Academy of Science, Engineering and Technology.
    August 2014, vol. 92(8). 2674 - 2677
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/9999167.