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A Card-based Visual Query System for Geographical Information Systems.

, , and . ScanGIS, page 131-142. Department of Surveying, Helsinki University of Technology, (2003)

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A Simple Proof on the Decidability of Equivalence Between Recursive and Nonrecursive Datalog Programs., , , , and . Inf. Process. Lett., 55 (5): 279-282 (1995)An Emblem Literature Database on Internet., , , , , and . IADT, page 474-481. Society for Design and Process Science, 1302 West 25th Street, Suite 300, Austin, TX 78705-4236, USA, (1998)The Chase of Datalog Programs., , , and . BNCOD, volume 1405 of Lecture Notes in Computer Science, page 165-166. Springer, (1998)A Characterization of Constant-time-mainteinability for BCNF Database Schemes., and . SIGMOD Conference, page 209-217. ACM Press, (1988)SIGMOD Record 17(3), September 1988.Constant-Time-Maintainable BCNF Database Schemes., and . ACM Trans. Database Syst., 16 (4): 571-599 (1991)On the Desirability of gamma-Acyclic BCNF Database Schemes., and . ICDT, volume 243 of Lecture Notes in Computer Science, page 105-122. Springer, (1986)A Card-based Visual Query System for Geographical Information Systems., , and . ScanGIS, page 131-142. Department of Surveying, Helsinki University of Technology, (2003)A general procedure to check conjunctive query containment., , , and . Acta Informatica, 38 (7): 489-529 (2002)Independence-Reducible Database Schemes., and . J. ACM, 38 (4): 854-886 (1991)Testing Unboundedness of Database Schemes and Functional Dependencies., and . Inf. Process. Lett., 28 (6): 317-326 (1988)