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ProblemsMichael W. Botsko, Mowaffaq Hajja, G.R.A.20 Problem Solving Group, Michel Bataille, Scott N. Armstrong, Ovidiu Furdui, Li Zhou, Shahin Amrahov, Lloyd Husbands, Josh Nichols-Barrer, Yanir A. Rubinstein, Olof Sisask, Luz M. DeAlba, Jeffrey Langford, Victor Y. Kutsenok, David P. Lang, Michael Goldenberg, Mark Kaplan, Gerald A. Edgar and Robert Calcaterra · Mathematics Magazine · 2007