1.
Lindström Åke, Svensson S, Green M, Ottvall R. Distribution and population changes of two subspecies of Chiffchaff Phylloscopus collybita in Sweden. Ornis Svec [Internet]. 2007 Oct. 1 [cited 2024 Mar. 29];17(3–4):137-4. Available from: https://journals.lub.lu.se/os/article/view/22684