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ProblemsPeter Ross, Frank Schmidt, Paul R. Scott, Mark Krusemeyer, Murray S. Klamkin, Norman Schaumberger, Lennart Rade, Bernardo Recaman, Michael Zielinski, Helen M. Marston, K. R. S. Sastry, XAMPLE, the XAvier Mathematics Problem LEague, William P. Wardlaw, Reiner Martin, David Callan, Kevin Ford, N. J. Lord, Edward T. H. Wang, Allan Pedersen, G. Behforooz and David W. Koster · Mathematics Magazine · 1990