Autor:	Clark, Andrew, Duckworth, Dyce, Hutchinson, Jonathan, Black, J. Watt, Bloomfield, Humphrey J., May, Bennett, Mercer, Robert
Zdroj:	The British Medical Journal, 1892 Apr . 1(1633), 812-818.
Databáze:	JSTOR Journals
Externí odkaz:	https://www.jstor.org/stable/20245847 Zobrazit plný text záznamu