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ProblemsRobert E. Shafer, M. S. Klamkin, Vis Upatrisringa, Clark Kimberling, Arthur C. Segal, R. S. Luthar, Peter A. Lindsrom, Norman Schaumberger, Michael Vowe, David Farnsworth, Eugene Levine, Gengzhe Chang and Mike Chamberlain · The College Mathematics Journal · 1986