NILSSON, L.; HAAS, F. Distribution and numbers of wintering waterbirds in Sweden in 2015 and changes during the last fifty years. Ornis Svecica, Lund, Sweden, v. 26, n. 1, p. 3–54, 2016. DOI: 10.34080/os.v26.21854. Disponível em: https://journals.lub.lu.se/os/article/view/21854. Acesso em: 7 jul. 2022.