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ProblemsMcWorter,, William A.; Sved, Marta; Erdös, Paul; Siskakis, Aristomenis; Shafer, Robert E.; Mycielski, Jan; Ruderman, Harry D.; Schlosser, J.; Howard, J.; Izard, Roger; COPS, The; Nummela, Eric C.; Ruderman, Harry D.; Heuer, G. A.; Demir, Hüseyin; Webb, J. H.; Rigby, J. F.; Euler, Russell; Linders, J. C.; Newcomb, William A. · Mathematics Magazine · 1985