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ProblemsM. S. Klamkin, James Propp, Thomas R. Nicely, Gerald Wildenberg, Douglas Lewan, Hugh Noland, Marlow Sholander, Karl Heuer, G. A. Heuer, Edwin P. McCravy, Gordon Fisher, C. S. Gardner, A. Liu, Richard Beigel, Bert Waits, Problem Solving Group - University of Hartford, Barbara Turner, Douglas Underwood and Hans Kappus · Mathematics Magazine · 1980