8Deng J L.Control problems of gray systems[J].Systems & Control Letters,1982,1(5):288～294.
9Charnes A,Cooper W W,Rhodes E.Measuring the efficiency of decision making units[J].European Journal of Operational Research,1978,(6):429～444.
10Yang Yinsheng,LI Hongwei,Tong Jin.Green assessment of multi-product based on concordance analysis[A].Proceedings of 2001 International Conference on Management Science & Engineering(Volume Ⅱ)[C]Harbin University of Technology Press,2001,8:1876～1880.
