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4Hoekstra A Y,Hung P Q.Virtual Water Trade,A Quan tifieation of virtual water flows between nations in relation to international crop trade. Technical Report Virtual Water Research Report Series No. 11, IHE Delft,2002
5Chapagain A K, Hoekstra A Y.Vitual water trade: a qualification of virtual water flows between nations in relation to international trade of livestock and livestock products.In:AHoekstra A Y Edited. Virtual Water Trade:Proceedings of the International Exp
6Oki T, Sato M, Kawamura A, Miyake M, Kanae S, Musiake K. Virtual water trade to Japan and in the world. In: Hoekstra A Y Edited.Virtual Water Trade: Proceedings of the International Expert Meeting on Virtual Water Trade. Value of Water Research Report Ser
