1. Groundwater and River Resources Programme on a European Scale (GRAPES),2000
2. Trends in 20th century drought over the continental United States;Andreadis;Geophys. Res. Lett.,2006
3. Twentieth-century drought in the conterminous United States;Andreadis;J. Hydrometeorol.,2005
4. Bates, B.C., Kundzewicz, Z.W., Wu, S., Palutikof, J.P. (Eds), 2008. Climate Change and Water. Technical Paper of the Intergovernmental Panel on Climate Change, IPCC Secretariat, Geneva, 210p.
5. Simplicity versus complexity in modelling groundwater recharge in chalk catchments;Bradford;Hydrol. Earth Syst. Sci.,2002