Iceberg Query Lattices for Datalog.
In: K. E. Wolff, H. D. Pfeiffer and H. S. Delugach, editors, Conceptual Structures at Work: 12th International Conference on Conceptual Structures (ICCS 2004), volume 3127, series LNCS, pages 109-125. Springer, Heidelberg, 2004.
Gerd Stumme.
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