By Karls Michael A.   in PRIMUS

ISSN:1051-1970|23|8|733-747

Taylor & Francis Ltd‎(2013)‎

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By Karls Michael A.   Skoczelas Brenda M.   in Mathematics Magazine

ISSN:1930-0980|82|5|343-353

Mathematical Association of America‎(2009)‎

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By Karls Michael   in PRIMUS

ISSN:1051-1970|21|1|26-46

Taylor & Francis Ltd‎(2011)‎

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