Yan, Ming, Kunpeng Yi, Junjian Zhang, Nyambayar Batbayar, Zhenggang Xu, Guanhua Liu, Binhua Hu, et al. “Flyway Connectivity and Population Status of the Greylag Goose Anser Anser in East Asia”. Wildfowl (December 30, 2020): 157–180. Accessed December 16, 2025. https://tidsskrift.dk/Wildfowl/article/view/156283.