Nilsson, Leif, and Hakon Persson. “Variation in Survival in an Increasing Population of the Greylag Goose Anser Anser in Scania, Southern Sweden”. Ornis Svecica 3, no. 3–4 (October 1, 1993): 137–146. Accessed March 28, 2024. https://journals.lub.lu.se/os/article/view/23038.