By Flum J.   Grohe M.   in Information and Computation

ISSN:0890-5401|187|2|291-319

Elsevier‎(2003)‎

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By Flum J.   Schiehlen M.   Väänänen J.   in Studia Logica

ISSN:0039-3215|62|3|315-340

Springer Publishing Company ‎(1999)‎

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