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.