KORZYUKOV, A I; KOSHELEV, A I; SEREBRYAKOV, V V. Recent status of Mute Swans Cygnus olor in the Ukraine, USSR. Wildfowl, [S. l.], p. 49–52, 2013. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/155003. Acesso em: 17 dec. 2025.