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ProblemsDaniel Ullman, Vaclav Konecny, Jany C. Binz, M. S. Klamkin, A. Liu, K. R. S. Sastry, David M. Bloom, David Callan, C. S. Gardner, Con Amore Problem Group, Leroy F. Meyers, Donald F. Bailey, Yan-loi Wong, Edward T. H. Wang, Barry Brunson, David Graves, N. J. Lord, Y. H. Kwong, James C. Hickman, William F. Trench, Mihaly Bencze and William Watkins · Mathematics Magazine · 1989