By Ford William F.   Pennline James A.   in American Mathematical Monthly

ISSN:1930-0972|114|1|58-60

Mathematical Association of America‎(2007)‎

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By Beauchamp Charles F   Ford William F   Tatum Douglas M   in Business Economics

ISSN:0007-666X|48|2|140-142

Palgrave Macmillan Ltd‎(2013)‎

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