By Bell Denis   in The Mathematical Intelligencer

ISSN:0343-6993|33|1|92-95

Springer Publishing Company ‎(2011)‎

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By Bell Denis   in Journal of Geometry

ISSN:0047-2468|85|1-2|15-21

Springer Publishing Company ‎(2006)‎

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By Bell Denis   in The College Mathematics Journal

ISSN:1931-1346|46|4|299-299

Mathematical Association of America‎(2015)‎

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