Zhang Y and R-F Shen (2004). “Demonstration Research on Evaluating Investment Value of Listed Companies by Data Envelopment Analysis.” J Tongji University – Natural Science 32(7): 961-965.

Zhang Y and R-F Shen (2004). “Demonstration Research on Evaluating Investment Value of Listed Companies by Data Envelopment Analysis.” J Tongji University – Natural Science 32(7): 961-965.

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