1. Summary for policymakers,2007
2. Simulation of hydrologic changes associated with global warming;Whetherald;J Geophys Res,2002
3. Regions at risk: a geographical introduction to disasters;Hewitt,1997
4. WMO׳s role in the International decade for natural disaster reduction;Obasi;Bull Am Meteorol Soc,1994
5. Drought as a natural hazard: concepts and definitions;Wilhite,2000