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ProblemsMurray Klamkin, Edward F. Vitek, K. R. S. Sastry, Norman Schaumberger, Eugene Levine, Kim McInturff, Peter Simon, William P. Wardlaw, Martin Feuerman, Thomas E. Elsner, Joe Evans, Zun Shan, Edward T. H. Wang, Steven Schonefeld, George Boros, The NKU Problems Group, Brian Amrine, Phil Clarke, Van Nuys, R. S. Luthar, Michael Vowe, Patrick Collier, Philip D. Straffin, Bill Mixon, Bert K. Waits and Mark Biegert · The College Mathematics Journal · 1989