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ProblemsR. S. Luthar, Dave Ohlsen, Clark Kimberling, Alvin Tirman, Robert E. Shafer, Sudhir Kumer Goel, Margaret Cibes, Chico Problem Group, Walter Blumberg, Syrous Marivani, M. S. Klamkin, Michael Vowe, Donna Calhoun and Paul M. Harms · The College Mathematics Journal · 1987