WASET
    Shao-lun Zeng and  Yu-long Ren,  Benchmarking Cleaner Production Performance of Coal-fired Power Plants Using Two-stage Super-efficiency Data Envelopment Analysis.   journal   = {International Journal of Economics and Management Engineering}, [online]. World Academy of Science, Engineering and Technology.
    June 2010, vol. 42(6). 1245 - 1251
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/13094.