By Hemaspaandra L.A.   Hempel H.   in Theoretical Computer Science

ISSN:0304-3975|302|1|457-466

Elsevier‎(2003)‎

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By Beigel R.   Hemaspaandra L.A.   Hempel H.   Vogel J.   in Information and Computation

ISSN:0890-5401|173|2|123-131

Academic Press‎(2002)‎

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