Autor:	Luthar, R. S., Ohlsen, Dave, Kimberling, Clark, Tirman, Alvin, Shafer, Robert E., Goel, Sudhir Kumer, Cibes, Margaret, Blumberg, Walter, Marivani, Syrous, Klamkin, M. S., Vowe, Michael, Calhoun, Donna, Harms, Paul M.
Zdroj:	The College Mathematics Journal, 1987 May 01. 18(3), 248-252.
Databáze:	JSTOR Journals
Externí odkaz:	https://www.jstor.org/stable/2686388 Zobrazit plný text záznamu