Wang Z-L, J-H Tian and L Qiu (2005). “Data Envelopment Analysis of Urban Water Supply Performance.” Shuili Xuebao/J Hydraulic Engineering 36(12): 1486-1491.
Wang Z-L, J-H Tian and L Qiu (2005). “Data Envelopment Analysis of Urban Water Supply Performance.” Shuili Xuebao/J Hydraulic Engineering 36(12): 1486-1491.