Li Y-l, J-y Pan and Y-x Chen (2005). “Research on Evaluating the Efficiency of Enterprise Technology Innovation Based on DEA Method.” Hebei J Industrial Science and Technology 22(2): 74-80.

Li Y-l, J-y Pan and Y-x Chen (2005). “Research on Evaluating the Efficiency of Enterprise Technology Innovation Based on DEA Method.” Hebei J Industrial Science and Technology 22(2): 74-80.

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