Autor:	Robertson, M. S., Mahrenholz, Johannes, Grant, H. S., Janes, W. C., Yates, Robert C., Hausmann, B. A., Kennedy, E. C., Arany, Daniel, Ayres,, Frank, Altshiller-Court, Nathan, Trigg, C. W., Thebault, V., Evans, John Ellis, Parker, W. V., Grossman, Howard D., Thomas, Paul D., Clarke, Walter B.
Zdroj:	National Mathematics Magazine, 1940 Apr 01. 14(7), 414-422.
Databáze:	JSTOR Journals
Externí odkaz:	https://www.jstor.org/stable/3028919 Zobrazit plný text záznamu