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C. E. Springer, Nelson Robinson, A. Sisk, Nev. R. Mind, H. C. D. McCluskey, V. Thebault, Paul D. Thomas, J. Frank Arena, S. W. Reaves, D. L. MacKay, N. A. Court, William Taylor, Problem Department, National Mathematics Magazine, Vol. 17, No. 8 (May, 1943), pp. 362-369
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