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V. Thebault, C. A. Balof, Walter B. Clarke, W. V. Parker, J. Rosenbaum, Arnold Emch, H. T. R. Aude, D. L. MacKay, Eunice Lewis, C. W. Trigg, O. E. Lancaster, Johannes Mahrenholz, Robert C. Yates, I. C. Nichols, Thomas F. Mulcrone, E. P. Starke, G. W. Wishard, Yudell Luke, H. S. Grant, C. N. Mills, Albert Farnell, Problem Department, National Mathematics Magazine, Vol. 13, No. 8 (May, 1939), pp. 379-397
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Thebault et al. (1939) studied this question.
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