Autor:	Buck, R. C., Penner, Sidney, Schaumberger, Norman, Ahuja, Mangho, Page, Warren, Pinker, Aron, Africk, Henry, Murdock, James W., Aulicino, Dan, Filaseta, Michael, Berman, Martin, Maskell, F. G. B., Utz, W. R., Luthar, R. S., Carpenter, James E.
Zdroj:	The Two-Year College Mathematics Journal, 1978 Nov 01. 9(5), 297-302.
Databáze:	JSTOR Journals
Externí odkaz:	https://www.jstor.org/stable/3026480 Zobrazit plný text záznamu