Korner-Nievergelt, F. R., Hofer, J., Sauter, A., & Jenni, L. (2009). Measuring within-winter movement rates of Tufted Duck Aythya fuligula and Common Pochard A. ferina based on ring re-encounter data. Wildfowl, 24–41. Retrieved from https://tidsskrift.dk/Wildfowl/article/view/153583