Peterz, Mats. “Timing and Seasonal Changes in Eider Somateria Mollissima Spring Migration in the Northern Öresund, South Sweden, 1975–2001”. Ornis Svecica 13, no. 4 (October 1, 2003): 115–122. Accessed November 24, 2024. https://journals.lub.lu.se/os/article/view/22803.