By Abiteboul S.   Vianu V.   in Journal of Computer and System Sciences

ISSN:0022-0000|58|3|428-452

Academic Press‎(1999)‎

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By Abiteboul S.   Cluet S.   Milo T.   in Theoretical Computer Science

ISSN:0304-3975|275|1|179-213

Elsevier‎(2002)‎

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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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By Abiteboul S.   Vardi M.Y.   Vianu V.   in Theoretical Computer Science

ISSN:0304-3975|149|1|101-128

Elsevier‎(1995)‎

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