Korzyukov, A. I., Koshelev, A. I. and Serebryakov, V. V. (2013) “Recent status of Mute Swans Cygnus olor in the Ukraine, USSR”, Wildfowl, pp. 49–52. Available at: https://tidsskrift.dk/Wildfowl/article/view/155003 (Accessed: 17 December 2025).