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Cook, S.; Johnson, N.; Swallow, B.; Ravnburg, H.; Beaulieu, N.; Mulligan, M.; Schreier, H.; Valentin, C.; Wani, S. P.; Penning de Vries, F.; Sanz, N.; Gottriet, V.; Westermann, O. 2002. Multiple use of upper catchments: toward a research agenda for Subtheme Two of the Challenge Program on water and food. Challenge Program on Water and Food background paper 2. In CGIAR Challenge Program on Water and Food. Challenge Program on Water and Food: background papers to the full proposal. Colombo, Sri Lanka: CGIAR Challenge Program on Water and Food. pp.43-84.