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Walter B. Clarke, Karleton W. Crain, Albert Farnell, M. L. Vest, V. Thebault, C. W. Trigg, J. Rosenbaum, Harry M. Gehman, Nathan Altshiller-Court, W. T. Short, Jeannette Simpson, G. W. Wishard, E. P. Starke, Alfred Moessner, Dewey C. Duncan, Problem Department, National Mathematics Magazine, Vol. 12, No. 6 (Mar., 1938), pp. 301-311
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Clarke et al. (1938) studied this question.
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