By Papanikolaou A.   Yan S.Y.   in International Journal of Computer Mathematics

ISSN:0020-7160|79|10|1049-1056

Taylor & Francis Ltd‎(2002)‎

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By Yan S. Y.   James G.   in International Journal of Mathematical Education in Science and Technology

ISSN:1464-5211|37|6|745-753

Taylor & Francis Ltd‎(2006)‎

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