Autor:	Blanchet, Louis V., Rappe, Charlotte S., Rappe, Gerald C., Dunkels, Andrejs, Boettler, James L., Krause, Eugene F., Henry, J. Bruce, Billstein, Rick, Shultz, Harris S., Moller, Gunther H., Wallach, Sidney
Zdroj:	The Mathematics Teacher, 1977 Nov 01. 70(8), 644-647.
Databáze:	JSTOR Journals
Externí odkaz:	https://www.jstor.org/stable/27961030 Zobrazit plný text záznamu