By Tefera Akalu   in International Journal of Mathematical Education in Science and Technology

ISSN:1464-5211|40|8|1091-1096

Taylor & Francis Ltd‎(2009)‎

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By Gay Carter C.   Tefera Akalu   Zeleke Aklilu   in The College Mathematics Journal

ISSN:1931-1346|39|2|145-148

Mathematical Association of America‎(2008)‎

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