KÄLLANDER, Hans. The recent decline of the Swedish Black-headed Gull Larus ridibundus population—a special issue of Ornis Svecica. Ornis Svecica, Lund, Sweden, v. 6, n. 1–2, p. 1–4, 1996. DOI: 10.34080/os.v6.23130. Disponível em: https://journals.lub.lu.se/os/article/view/23130. Acesso em: 22 feb. 2024.