Duan YR, P Tian and WP Zhang (2005). “Relative Efficiency Analysis of Complex System Based on Data Envelopment Analysis.” J Shanghai Jiaotong University 39(3): 433-436.

Duan YR, P Tian and WP Zhang (2005). “Relative Efficiency Analysis of Complex System Based on Data Envelopment Analysis.” J Shanghai Jiaotong University 39(3): 433-436.

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