By Emmons Caleb   in American Mathematical Monthly

ISSN:1930-0972|118|6|551-556

Mathematical Association of America‎(2011)‎

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By Emmons Caleb   in The College Mathematics Journal

ISSN:1931-1346|40|3|188-188

Mathematical Association of America‎(2009)‎

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By Emmons Caleb   in The Mathematical Intelligencer

ISSN:0343-6993|32|2|5-5

Springer Publishing Company ‎(2010)‎

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By Emmons Caleb J.   in Mathematics Magazine

ISSN:1930-0980|80|4|307-307

Mathematical Association of America‎(2007)‎

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By Emmons Caleb   Krebs Mike   Shaheen Anthony   in The College Mathematics Journal

ISSN:1931-1346|40|5|345-353

Mathematical Association of America‎(2009)‎

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