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Mathematical NotesTopping, D. M.; Cater, S.; Koh, Kwangil; Koh, Kwangil; Tikoo, Mohan Lal; Trollope, J. R.; BreMiller, R. S.; Sloyer, C. W.; Brillhart, John; Sanyal, Arun; von Randow, Rabe; Gilmer, R. W.; Levin, M. D.; Berberian, S. K.; Utz, W. R.; McCarthy, P. J. · The American Mathematical Monthly · 1967