1. Van Der Zaag P, Gupta J, Darvis LP (2009) HESS opinions: urgent water challenges are not sufficiently researched. Hydrol Earth Syst Sci 13:905–912
2. WISE (2008a) Water notes on the implementation of the Water Framework Directive. Water Note 1 – Joining forces for Europe’s shared waters: coordination in international river basin districts.
http://ec.europa.eu/environment/water/water-framework/pdf/water_note1_joining_forces.pdf
3. Lucier A, Palmer M, Mooney H, Nadelhoffer K, Ojima D, Chavez F (2006) Ecosystems and climate change: research priorities for the US climate change science program. Recommendations from the scientific community. Report on an Ecosystems Workshop, prepared for the Ecosystems Interagency Working Group. Special Series No SS-92-06, University of Maryland Centre for Environmental Science, Chesapeake Biological Laboratory, Solomons, MD, 50 pp.
http://www.usgcrp.gov/usgcrp/Library/ecosystems/eco-workshop-report-jun06.pdf
4. Bloomfield JP, Williams RJ, Goody DC, Cape JN, Guha P (2006) Impacts of climate change on the fate and behaviour of pesticides in surface and groundwater – a UK perspective. Sci Total Environ 369:163–177
5. CHE (2008a) Confederación Hidrográfica del Ebro.
http://oph.chebro.es/DatosBasicosCHE.html
. Accessed Oct 2008