Nilsson, Leif, Arne Follestad, Matthieu Guillemain, Vincent Schricke, and Berend Voslamber. “France As a Staging and Wintering Area for Greylag Geese Anser Anser”. Wildfowl 63 (December 19, 2013): 24–39. Accessed April 15, 2026. https://tidsskrift.dk/Wildfowl/article/view/153599.