By Gamal Elnagar   Vasilis Zafiris   in International Journal of Computer Mathematics

ISSN:0020-7160|82|2|193-202

Taylor & Francis Ltd‎(2005)‎

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By Elias Deeba   Jeong-Mi Yoon   Vasilis Zafiris   in International Journal of Mathematical Education in Science and Technology

ISSN:1464-5211|34|6|908-913

Taylor & Francis Ltd‎(2003)‎

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