Atkinson, P.W., Robinson, R.A., Clark, J.A., Miyar, T., Downie, I.S., du Feu, C., Fiedler, W., Fransson, T., Grantham, M.J., Gschweng, M., Spina, F. & Crick, H.Q.P. 2007. Migratory movements of waterfowl: a web-based mapping tool. EURING report to the EU Commission.