1Yuanhua Li, Randoph Barker. Increasing water productivity for paddy irrigation in China[J]. Paddy and Water Environment,2004(4):187-193.
2Loeve R, Hong L, Dong B, et al. Long term trends in intersectoral water allocation and crop water productivity in Zhanghe and Kaifeng, China[J]. Paddy and Water Environment, 2004(4) :237-245.