Kerbes, R H, M A Ogilvie, and H Boyd. “Pink-Footed Geese of Iceland and Greenland: a Population Review Based on an Aerial Survey of Pjrsrver in June, 1970”. Wildfowl, no. 22 (January 1, 1971): 5–17. Accessed December 18, 2025. https://tidsskrift.dk/Wildfowl/article/view/155419.