ULFVENS, J. Population and colony site dynamics in Black-headed Gulls Larus ridibundus breeding on the Finnish west coast. Ornis Fennica, [S. l.], v. 70, n. 2, p. 96–101, 1993. Disponível em: https://ornisfennica.journal.fi/article/view/133369. Acesso em: 17 sep. 2024.