KAMPE-PERSSON, Hakon. Tree-nesting—a new trend among Swedish Greylag Geese?. Ornis Svecica, Lund, Sweden, v. 17, n. 3–4, p. 187–189, 2007. DOI: 10.34080/os.v17.22683. Disponível em: https://journals.lub.lu.se/os/article/view/22683. Acesso em: 28 feb. 2024.