NILSSON, L.; PERSSON, H. Field choice of staging Greylag Geese Anser anser in relation to changes in agriculture in South Sweden. Ornis Svecica, Lund, Sweden, v. 8, n. 1–2, p. 27–39, 1998. DOI: 10.34080/os.v8.22958. Disponível em: https://journals.lub.lu.se/os/article/view/22958. Acesso em: 8 dec. 2022.