Wang X (1994). “Data Envelopment Analysis Approach on the Industrial Efficiency and Scales and its Application in Shandong.” J Systems Science and Systems Engineering 3(2): 140-147.

Wang X (1994). “Data Envelopment Analysis Approach on the Industrial Efficiency and Scales and its Application in Shandong.” J Systems Science and Systems Engineering 3(2): 140-147.

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