NILSSON, L.; HERMANSSON, C. Changes in numbers and distribution of wintering waterbirds around Gotland 1969–2020. Ornis Svecica, Lund, Sweden, v. 31, p. 78–93, 2021. DOI: 10.34080/os.v31.22254. Disponível em: https://journals.lub.lu.se/os/article/view/22254. Acesso em: 15 aug. 2022.