REES, Eileen C; BLACK, J M; SPRAY, C J; THORISSON, S. The breeding success of Whooper Swans Cygnus cygnus nesting in upland and lowland regions of Iceland - a preliminary analysis. Wildfowl, [S. l.], p. 187, 2013. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/154976. Acesso em: 17 dec. 2025.