Markus Krötzsch, Sebastian Rudolph, Pascal Hitzler. Conjunctive Queries for a Tractable Fragment of OWL 1.1. In Karl Aberer, Key-Sun Choi, Natasha Fridman Noy, Dean Allemang, Kyung-Il Lee, Lyndon J. B. Nixon, Jennifer Golbeck, Peter Mika, Diana Maynard, Riichiro Mizoguchi, Guus Schreiber, Philippe Cudré-Mauroux, editors, The Semantic Web, 6th International Semantic Web Conference, 2nd Asian Semantic Web Conference, ISWC 2007 + ASWC 2007, Busan, Korea, November 11-15, 2007. Volume 4825 of Lecture Notes in Computer Science, pages 310-323, Springer, 2007. [doi]
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