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Walter B. Clarke, C. W. Trigg, Yudell Luke, W. L. Roberts, H. S. Grant, C. N. Mills, E. P. Starke, J. Rosenbaum, Albert Farnell, Gaines B. Lang, Leo F. Epstein, W. V. Parker, D. L. MacKay, H. A. Simmons, Janet Rung, Harry M. Gehman, Virgil S. Mallory, V. Thebault, Altheod Tremblay, Robert C. Yates, C. Bull Foster, Problem Department, National Mathematics Magazine, Vol. 14, No. 5 (Feb., 1940), pp. 281-290
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Clarke et al. (1940) studied this question.
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