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ProblemsRabinowitz, Stanley; Callan, David; Norton, Vic; Christophe,, L. Matthew; Patruno, Gregg; McWorter,, William A.; Propp, James; Propp, James G.; Kuipers, L.; Ropp, Daniel; Nelsen, Roger B.; Kestelman, H.; Sourour, A. R.; Schwenk, Allen J.; Wagner, Carl; Lord, Graham; Walter, J.; Lindstrom, Peter W.; Pittel, Boris; Hernández, Víctor · Mathematics Magazine · 1985