Vinogradov VG, Auezov EM. Numbers, distribution and breeding success of Whooper Swans Cygnus cygnus and Mute Swans C. olor in central Kazakhstan, USSR, in 1985 and 1987. Wildfowl [Internet]. 2013 Apr. 16 [cited 2025 Dec. 16];:73-6. Available from: https://tidsskrift.dk/Wildfowl/article/view/154998