Autor:	Whitehouse, Paul, Usher, Timothy, Ruhlen, Merritt, Gell-Mann, Murray
Zdroj:	Proceedings of the National Academy of Sciences of the United States of America, 2004 Apr . 101(15), 5692-5695.
Databáze:	JSTOR Journals
Externí odkaz:	https://www.jstor.org/stable/3371682 Zobrazit plný text záznamu