Autor:	Ellis, C. D., Henderson, W. J.
Zdroj:	Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character, 1934 Aug 01. 146(856), 206-216.
Databáze:	JSTOR Journals
Externí odkaz:	https://www.jstor.org/stable/2935488 Zobrazit plný text záznamu