Batbayar, N., Takekawa, J. Y., Newman, S. H., Prosser, D. J., Natsagdorj, T., & Xiao, X. (2013). Migration strategies of Swan Geese Anser cygnoides from northeast Mongolia. Wildfowl, 90–109. Retrieved from https://tidsskrift.dk/Wildfowl/article/view/153552