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Phillips, D.J.H., Allan, J.A., Claassen, M., Granit, J., Jägerskog, A., Kistin, E., Patrick, M. & Turton, A.R. 2008. The TWO Analysis: Introducing a Methodology for the Transboundary Waters Opportunity Analysis. Report No. 23. Stockholm: Stockholm International Water Institute (SIWI). ISBN978-91-975872-3-5. Available online at http://www.siwi.org/documents/Resources/Reports/Report23_TWO_Analysis.pdf