BENGTSSON, Kenneth. Migratory routes and wintering areas of Swedish Black-headed Gull Larus ridibundus populations. Ornis Svecica, Lund, Sweden, v. 6, n. 1–2, p. 17–38, 1996. DOI: 10.34080/os.v6.22992. Disponível em: https://journals.lub.lu.se/os/article/view/22992. Acesso em: 19 apr. 2024.