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R. B. Thompson, Johannes Mahrenholz, W. V. Parker, Fred Marer, Fred Fender, C. W. Trigg, Yudell Luke, Walter B. Clarke, Henry Dantzig, J. Rosenbaum, M. S. Robertson, Albert Farnell, E. P. Starke, Robert C. Yates, M. Kac, L. E. Bush, V. Thebault, J. W. Peters, Problem Department, National Mathematics Magazine, Vol. 13, No. 6 (Mar., 1939), pp. 284-295
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Thompson et al. (1939) studied this question.
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