WASET
    Yanshuang Zhang and  Byungho Jeong,  A DEA Model for Performance Evaluation in The Presence of Time Lag Effect.   journal   = {International Journal of Industrial and Manufacturing Engineering}, [online]. World Academy of Science, Engineering and Technology.
    September 2012, vol. 69(9). 1868 - 1871
    [viewed 19 April 2024]. Available from: https://publications.waset.org/pdf/3127.