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2. The Description Logic Handbook;Baader,2007
3. Baader, F., Brandt, S., Lutz, C., 2005a. Pushing the EL envelope. LTCS-Report LTCS-05-01, Chair for Automata Theory, Institute for Theoretical Computer Science, Dresden University of Technology, Germany, 2005. See http://lat.inf.tu-dresden.de/research/reports.html
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5. Computing least common subsumers in description logics with existential restrictions;Baader,1999