Jonsson, J E, and A Gardarsson. “Pair Formation in Relation to Climate: Mallard, Eurasian Wigeon and Eurasian Teal Wintering in Iceland”. Wildfowl 52 (November 1, 2001): 55–68. Accessed April 15, 2026. https://tidsskrift.dk/Wildfowl/article/view/153966.