Zhukov, A. V., and A. Yu. Andryushchenko. “Relief and Ecological Niche of Mute Swan (Cygnus Olor (Gmelin, 1803)) Wintering in Sivash”. Acta Biologica Sibirica 3, no. 2 (July 26, 2017): 20-45. Accessed November 24, 2024. http://journal.asu.ru/biol/article/view/2730.