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APA Citation
Koshkina, A. I., Koshkin, A. V., Timoshenko, A. Y., Koshkin, A. A., & Schielzeth, H. (2019). a population survey of the endangered White-headed Duck Oxyura leucocephala in Kazakhstan shows an apparently increasing Eastern population. Bird study, 66(1), 111–120. http://access.bl.uk/ark:/81055/vdc_100086190179.0x000064