By Efthimiou Costas J.   in American Mathematical Monthly

ISSN:1930-0972|119|1|52-58

Mathematical Association of America‎(2012)‎

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By Efthimiou Costas J.   in American Mathematical Monthly

ISSN:1930-0972|120|5|459-461

Mathematical Association of America‎(2013)‎

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By Efthimiou Costas J.   in Mathematics Magazine

ISSN:1930-0980|79|5|376-379

Mathematical Association of America‎(2006)‎

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By Efthimiou Costas   Maronde Dan   McGreevy Tim     McCole Stefanie   in Physics Education

ISSN:0031-9120|46|4|421-429

IOP Publishing‎(2011)‎

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