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Mathworld [13]
Eric weissteins home page. [13]
http://arxiv.org [16]
www.number theory.org [15]
American Mathematical Society [6]
Iranian Mathematical Society [10]
European mathematical Society [54]
European mathematical Society [7]
London mathematical Society [7]
French mathematical Society [5]
institute for Research in Fundamental sciences [12]
purae Aplicada mathematical society [6]
http://2020 ok.com [8]
mehdi hassani”s home page [25]
michel waldschmidt”s home page [9]

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