FANG, Lei et al. Two distinct flyways with different population trends of Bewick’s Swan Cygnus columbianus bewickii in East Asia. Wildfowl, [S. l.], p. 13–42, 2020. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/156288. Acesso em: 13 feb. 2026.