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T. A. Bickerstaff, Robert W. Clack, J. T. Fairchild, C. A. Balof, W. R. Volckhausen, J. Rosenbaum, G. W. Wishard, H. T. R. Aude, E. P. Starke, W. V. Parker, Alfred Moessner, Albert Farnell, Michael Wales, Walter B. Clarke, C. W. Trigg, E. M. Shirley, R. B. Thompson, Yudell Luke, M. S. Robertson, V. Thebault, C. E. Springer, Problem Department, National Mathematics Magazine, Vol. 13, No. 2 (Nov., 1938), pp. 93-102
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