By Katsuura Hidefumi   in The College Mathematics Journal

ISSN:1931-1346|40|4|275-278

Mathematical Association of America‎(2009)‎

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By Katsuura Hidefumi   in The College Mathematics Journal

ISSN:1931-1346|43|4|325-330

Mathematical Association of America‎(2012)‎

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By Katsuura Hidefumi   in American Mathematical Monthly

ISSN:1930-0972|122|4|376-376

Mathematical Association of America‎(2015)‎

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