1.
Källander H. The recent decline of the Swedish Black-headed Gull Larus ridibundus population—a special issue of Ornis Svecica. Ornis Svec [Internet]. 1996 Apr. 1 [cited 2024 Feb. 21];6(1–2):1-4. Available from: https://journals.lub.lu.se/os/article/view/23130