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Howard Eves, Joseph S. Guerin, L. M. Kelly, Howard Grossman, H. E. Fettis, N. A. Court, C. E. Springer, P. D. Thomas, A. Sisk, Nev. R. Mind, J. H. Butchart, V. Thebault, Pedro A. Piza, W. E. Byrne, D. L. MacKay, Frank C. Gentry, Problem Department, National Mathematics Magazine, Vol. 20, No. 2 (Nov., 1945), pp. 95-104
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Eves et al. (1945) studied this question.
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