By Galiffa Daniel J.   Ong Boon W.   in Journal of Difference Equations and Applications

ISSN:1023-6198|20|9|1372-1381

Taylor & Francis Ltd‎(2014)‎

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By Downey Lawrence   Ong Boon W.   Sellers James A.   in The College Mathematics Journal

ISSN:1931-1346|39|5|391-394

Mathematical Association of America‎(2008)‎

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