By Niculescu Constantin   in The Mathematical Intelligencer

ISSN:0343-6993|33|1|2-4

Springer Publishing Company ‎(2011)‎

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By Dutkay Dorin Ervin   Niculescu Constantin P.   Popovici Florin   in American Mathematical Monthly

ISSN:1930-0972|120|8|737-740

Mathematical Association of America‎(2013)‎

Access to resources Favorite 10.290142