By Ollerton Richard L.   in International Journal of Mathematical Education in Science and Technology

ISSN:1464-5211|38|1|124-127

Taylor & Francis Ltd‎(2007)‎

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By Ollerton Richard L.   in Mathematics Magazine

ISSN:1930-0980|81|4|302-302

Mathematical Association of America‎(2008)‎

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By Ollerton Richard L.   in International Journal of Mathematical Education in Science and Technology

ISSN:1464-5211|44|4|609-614

Taylor & Francis Ltd‎(2013)‎

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