Fang, Lei, Junjian Zhang, Qingshan Zhao, Diana Solovyeva, Didier Vangeluwe, Sonia B. Rozenfeld, Thomas Lameris, et al. “Two Distinct Flyways With Different Population Trends of Bewick’s Swan Cygnus Columbianus Bewickii in East Asia”. Wildfowl (December 30, 2020): 13–42. Accessed December 16, 2025. https://tidsskrift.dk/Wildfowl/article/view/156288.