Autor:	Farr, C. Coleridge, Macleod, D. B.
Zdroj:	Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character, 1920 Apr 01. 97(682), 80-98.
Databáze:	JSTOR Journals
Externí odkaz:	https://www.jstor.org/stable/93917 Zobrazit plný text záznamu