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ProblemsJerrold W. Grossman, Allen J. Schwenk, Benjamin G. Klein, John Layman, S. Kung, Fouad Nakhli, Lawrence J. Wallen, David Singmaster, Heather Vaughan, Constantin Gonciulea, Mathematical Problem Solving Group, Shippensburg University, Bjorn Poonen, Edward Kitchen, John C. Nichols, G. J. Griffith, Victor Hernandez, John O. Kiltinen, J. Metzger, S. Kaler, M. Riazi-Kermani and Harry Ruderman · Mathematics Magazine · 1987