LINDSTRÖM, Åke; HEDENSTRÖM, A.; PETTERSSON, J. The autumn migration of Willow Warblers Phylloscopus trochilus in Sweden: results from a nation-wide co-operative project. Ornis Svecica, Lund, Sweden, v. 6, n. 4, p. 145–172, 1996. DOI: 10.34080/os.v6.22980. Disponível em: https://journals.lub.lu.se/os/article/view/22980. Acesso em: 20 jan. 2022.