Nilsson, Leif. “Spring Staging of Eiders Somateria Mollissima in Some Swedish East Coast Archipelagos and at Gotland 2009 and 2010”. Ornis Svecica 25, no. 1–2 (January 1, 2015): 70–73. Accessed February 24, 2024. https://journals.lub.lu.se/os/article/view/22550.