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ProblemsIliya Bluskov, John Sternitzky, Robert Calcaterra, John C. George, Mihály Bencze, Michel Bataille, H. A. ShahAli, Jung-Jin Lee, Jerry Metzger, Northwestern University Math Problem Solving Group, Jody M. Lockhart, William P. Wardlaw, José Luis Díaz-Barrero, Tom Leong, Brian T. Gill, J. P. V. Abad, Steven Butler, David Callan, William Moser and G.R.A.20 Problem Solving Group · Mathematics Magazine · 2006