1.
Landgren T. Re-distribution of Black-headed Gull Larus ridibundus colonies in NE Vänern during 1985—1995. Ornis Svec [Internet]. 1996 Apr. 1 [cited 2022 Dec. 6];6(1–2):45-56. Available from: https://journals.lub.lu.se/os/article/view/22994