1. Fortunately there are substitutes for water otherwise our hydro-political futures would be impossible;Allan,1993
2. Overall perspectives on countries and regions;Allan,1994
3. Chapagain, A.K., Hoekstra, A.Y., 2003. Virtual water flows between nations in relation to trade in livestock and livestock products. Value of Water Research Report Series No. 13. UNESCO-IHE, Delft, the Netherlands. http://www.waterfootprint.org/Reports/Report13.pdf.
4. Carbon emissions and resources use by Chinese economy 2007: a 135-sector inventory and input–output embodiment;Chen;Commun. Nonlinear Sci. Numer. Simulat.,2010
5. Greenhouse gas emissions and natural resources use by the world economy: ecological input–output modeling;Chen;Ecol. Model.,2011