Nilsson, Leif, Arne Follestad, Matthieu Guillemain, Vincent Schricke, and Berend Voslamber. “France As a Staging and Wintering Area for Greylag Geese Anser Anser”. Wildfowl (December 19, 2013): 24–39. Accessed December 16, 2025. https://tidsskrift.dk/Wildfowl/article/view/153599.