@TechReport{Baader-LTCS-04-02,
  author =       {F.~Baader},
  title =        {A Graph-Theoretic Generalization of the Least Common Subsumer
                 and the Most Specific Concept in the Description Logic EL},
  institution =  {Chair for Automata Theory, Institute for Theoretical
                  Computer Science, Dresden University of Technology},
  year =         2004,
  type =         {LTCS-Report},
  number =       {LTCS-04-02},
  address =      {Germany},
  note =         {See
                  http://lat.inf.tu-dresden.de/research/reports.html.}
}