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Mathematical NotesWarne, R. J.; Luh, Jiang; Naimpally, S. A.; Thomas, J. P.; Frank, Peter; Silverman, Robert; Williams, R. E.; Brawley, J. V.; Bollobás, B.; Gandhi, J. M.; Kanti Das, Mrinal; Anderson, D. R.; Kay, D. C.; Singmaster, David; Singmaster, Geralda; Allen, D. J. · The American Mathematical Monthly · 1967