Clausen, Kevin K., Henning Heldbjerg, and Anthony D. Fox. “Status, Origin and Harvest of Increasing Numbers of Greylag Geese Anser Anser Occurring in Denmark Throughout the Annual Cycle”. Wildfowl (November 14, 2025): 3–25. Accessed December 16, 2025. https://tidsskrift.dk/Wildfowl/article/view/156397.