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Mathematical NotesKlarner, D. A.; Bond, James; Yoeli, Michael; Kulkarni, R. S.; Behzad, Mehdi; Chartrand, Gary; Wong, Yung-Chow; Au-Yeung, Yik-Hoi; Parnami, J. C.; Gioia, A. A.; Vaidya, A. M.; Haber, Seymour; Gray, W. J.; Zame, Alan; Williams, K. S.; Beesack, P. R. · The American Mathematical Monthly · 1967