Viksne, Janis, Mara Janaus, and Antra Stipniece. “Recent Trends of the Black-Headed Gull Larus Ridibundus Population in Latvia”. Ornis Svecica 6, no. 1–2 (April 1, 1996): 39–44. Accessed November 22, 2024. https://journals.lub.lu.se/os/article/view/22993.