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William Hoover, J. Scheffer, Elmer Schuyler, Lon C. Walker, H. C. Whitaker, G. B. M. Zerr, P. S. Berg, H. R. Higley
1901 The American mathematical monthly  
doi:10.2307/2970606 fatcat:wf6hgygiorafnb5t4tvl7ah6qu