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Molle, François; Jayakody, Priyantha; Ariyaratne, B. Ranjith; Somatilake, H. S.(International Water Management Institute (IWMI), Colombo, Sri Lanka, 2005)
Larson, Donald F.; Otsuka, Keijiro; Kajisa, Kei; Estudillo, Jonna; Diagne, Aliou(The World Bank, Agriculture and Rural Development Team, New York, 2010)
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