By Givens Berit Nilsen   Linton Karen   Rosin Amber   Dishman Laurie   in Semigroup Forum

ISSN:0037-1912|74|3|370-378

Springer Publishing Company ‎(2007)‎

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By Bermudez Frank   Medina Anthony   Rosin Amber   Scott Eren   in The College Mathematics Journal

ISSN:1931-1346|44|4|315-322

Mathematical Association of America‎(2013)‎

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