Solovyeva, Diana V., Kazuo Koyama, and Sergey Vartanyan. “Living Child-Free: Proposal for Density-Dependent Regulation in Bewick’s Swans Cygnus Columbianus Bewickii”. Wildfowl (November 27, 2019): 197–210. Accessed February 13, 2026. https://tidsskrift.dk/Wildfowl/article/view/154481.