By Hetzel Andrew J.   in International Journal of Mathematical Education in Science and Technology

ISSN:1464-5211|37|4|488-491

Taylor & Francis Ltd‎(2006)‎

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By Dobbs David   Hetzel Andrew   in Rendiconti del Circolo Matematico di Palermo

ISSN:0009-725X|53|1|71-84

Springer Publishing Company ‎(2004)‎

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By Hetzel Andrew J.   Liew Jay S.   Morrison Kent E.   in American Mathematical Monthly

ISSN:1930-0972|114|6|491-499

Mathematical Association of America‎(2007)‎

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