BOIKO, D.; KAMPE-PERSSON, H. Moult migration of Latvian Whooper Swans Cygnus cygnus. Ornis Fennica, [S. l.], v. 89, n. 4, p. 273–280, 2012. DOI: 10.51812/of.133815. Disponível em: https://ornisfennica.journal.fi/article/view/133815. Acesso em: 20 may. 2024.