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Elementary Problems: E2002,2006-E2014F. Leuenberger, A. S. Howard, W. A. Donnell, Murali Rao, R. A. Avelsgaard, R. E. Stockton, D. R. Rao, R. C. Entringer, R. S. Kulkarni, Walter Noll, Erwin Just and Norman Schaumberger · The American Mathematical Monthly · 1967