Du HB, PL Gu and H Hao (2005). “Decision of Returns to Scale of DMU on the Basis of CCR Model.” J Harbin Institute of Technology 37(3): 329-331.

Du HB, PL Gu and H Hao (2005). “Decision of Returns to Scale of DMU on the Basis of CCR Model.” J Harbin Institute of Technology 37(3): 329-331.

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