NILSSON, Leif. Survey of wintering Whooper Swans Cygnus cygnus in Sweden in January 2015, and habitat shift in 1995–2015. Ornis Svecica, Lund, Sweden, v. 26, n. 1, p. 55–60, 2016. DOI: 10.34080/os.v26.22532. Disponível em: https://journals.lub.lu.se/os/article/view/22532. Acesso em: 27 apr. 2024.