Annual Variation in the Proportion of Whooper Swans and Bewick's Swans Breeding in Northern European Russia

Autor:	Shchadilov, Yuri M., Rees, Eileen C., Belousova, Anna V., Bowler, John M.
Zdroj:	Waterbirds: The International Journal of Waterbird Biology, 2002 Jan 01. 25, 86-94.
Databáze:	JSTOR Journals
Externí odkaz:	https://www.jstor.org/stable/1522338 Zobrazit plný text záznamu