By da Fonseca G.D.   de Figueiredo C.M.H.   Carvalho P.C.P.   in Information Processing Letters

ISSN:0020-0190|89|3|151-157

Elsevier‎(2004)‎

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By Dias V.M.F.   da Fonseca G.D.   de Figueiredo C.M.H.   Szwarcfiter J.L.   in Theoretical Computer Science

ISSN:0304-3975|306|1|391-405

Elsevier‎(2003)‎

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