Andersson, Christer K, and Pär Sandberg. “Winter Occupation of Breeding Territories of Peregrine Falcon Falco Peregrinus in Western Sweden 2000 2001–2004 2005”. Ornis Svecica 25, no. 1–2 (January 1, 2015): 15–23. Accessed April 28, 2024. https://journals.lub.lu.se/os/article/view/22551.