By Pereira de śa Vinícius G.   de Figueiredo Celina M. H.   in American Mathematical Monthly

ISSN:1930-0972|121|7|600-609

Mathematical Association of America‎(2014)‎

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By Dantas Simone   de Figueiredo Celina M.H.   Gravier Sylvain   Klein Sulamita   in RAIRO - Theoretical Informatics and Applications

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Edp Sciences‎(2010)‎

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Edp Sciences‎(2010)‎

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