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First Order Paths in Ordered Trees.. ICDT, volume 3363 of Lecture Notes in Computer Science, page 114-128. Springer, (2005)Containment of acyclic conjunctive queries with negated atoms or arithmetic comparisons., and . Inf. Process. Lett., (2017)Undecidable Relativizations of Algebras of Relations., and . J. Symb. Log., 64 (2): 747-760 (1999)Amalgamation in Relational Algebras.. J. Symb. Log., 63 (2): 479-484 (1998)Relation Algebra with Binders.. J. Log. Comput., 11 (5): 691-700 (2001)Navigational XPath: calculus and algebra., and . SIGMOD Record, 36 (2): 19-26 (2007)Semantic characterizations of navigational XPath., and . SIGMOD Record, 34 (2): 41-46 (2005)Focused retrieval and result aggregation with political data., and . Inf. Retr., 13 (5): 412-433 (2010)Tree patterns with Full Text Search., and . WebDB, ACM, (2010)Evaluation Methods for Rankings of Facetvalues for Faceted Search., and . CLEF, volume 6941 of Lecture Notes in Computer Science, page 131-136. Springer, (2011)