By Crescenzi P.   Papadimitriou C.H.   in Theoretical Computer Science

ISSN:0304-3975|143|1|159-165

Elsevier‎(1995)‎

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By Papadimitriou C.H.   Yannakakis M.   in Journal of Computer and System Sciences

ISSN:0022-0000|58|3|407-427

Academic Press‎(1999)‎

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By Papadimitriou C.H.   Yannakakis M.   in Journal of Computer and System Sciences

ISSN:0022-0000|54|1|48-60

Academic Press‎(1997)‎

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By Abiteboul S.   Papadimitriou C.H.   Vianu V.   in Information and Computation

ISSN:0890-5401|143|2|110-136

Academic Press‎(1998)‎

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