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ProblemsWm. R. Klinger, Stewart M. Venit, Norman Schaumberger, Sidney Kravitz, Charles W. Trigg, Zalman Usiskin, Peter A. Lindstrom, Allen Kaufman, David Price, Daniel Gallin, Mike Chamberlain, Santa Clara Problem Solving Ring, K. R. S. Sastry, Walter Blumberg, Hubert J. Ludwig, V. N. Murty, Peter Flusser and Dale T. Hoffman · The Two-Year College Mathematics Journal · 1981