8Wichelns. The policy relevance of virtual water can be enhanced by considering comparative advantages [J]. Agricultural Water Management, 2004, 66:49 - 63.
9Lant, C.L. Commentary:“Virtual water and occam' s Razor by Stephen Merrett and”virtual water-the water, food and trade Nexus:useful concept or misleading metaphor? by Tony Allan [J]. Water International, 28,(1):11-13.
10Allan,J. A. Virtual water-the water, food and trade nexus useful concept or misleading metaphor? [J]. IWRA, Water International,2003,28(1):4- 11.
7OKI T,SATO M,KAWAMURA A,et al. Virtual Water trade to Japan and in the World[M]//HOEKSTRA A Y. Virtual Water Trade: Proceedings of the International Exper Meeting onVirtual Water Trade,Research Report Series.IHE Delft,The Nether2 lands:2003.
8Virtual Water, Green Water and Blue Water in China [ EB/OL ]. www. nideco, ethz. ch/news/past events/colloquium 2003/Liu_Presentation. pdf.