Nilsson L, Andersson O, Gustafsson R, Svensson M. Increase and changes in distribution of breeding Whooper Swans Cygnus cygnus in northern Sweden from 1972-75 to 1997. Wildfowl [Internet]. 1998 Jan. 1 [cited 2025 Dec. 17];:6-17. Available from: https://tidsskrift.dk/Wildfowl/article/view/154602