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"Logical definability and query languages over ranked and unranked trees."
Michael Benedikt, Leonid Libkin, Frank Neven (2007)
- Michael Benedikt  , Leonid Libkin , Leonid Libkin , Frank Neven , Frank Neven : :
 Logical definability and query languages over ranked and unranked trees. ACM Trans. Comput. Log. 8(2): 11 (2007)

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