REES, Eileen C; BOWLER, Jonathan M. Feeding activities of Bewick’s Swans Cygnus columbianus bewickii at a migratory site in the Estonian SSR. Wildfowl, [S. l.], p. 249–255, 2013. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/154959. Acesso em: 17 dec. 2025.