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ISSN:0022-0000|65|3|508-525

Academic Press‎(2002)‎

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By Erdos P.L.   Steel M.A.   Szekely L.A.   Warnow T.J.   in Theoretical Computer Science

ISSN:0304-3975|221|1|77-118

Elsevier‎(1999)‎

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