REES, Eileen C; OWEN, M; GITAY, H; WARREN, S. The fate of plastic leg rings used on geese and swans. Wildfowl, [S. l.], p. 43–52, 1990. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/154044. Acesso em: 17 dec. 2025.