By Sprows David   in The College Mathematics Journal

ISSN:1931-1346|39|1|54-56

Mathematical Association of America‎(2008)‎

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By Sprows David   in International Journal of Mathematical Education in Science and Technology

ISSN:1464-5211|40|3|423-427

Taylor & Francis Ltd‎(2009)‎

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By Sprows David   in PRIMUS

ISSN:1051-1970|21|2|189-192

Taylor & Francis Ltd‎(2011)‎

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