@techreport{Donini-etal95-complexity,
  author	= {Donini, Francesco M. and Lenzerini, Maurizio and Nardi, Daniele and Nutt, Werner},
  title		= {The Complexity of Concept Languages},
  number	= {RR-95-07},
  address	= {Deutsches Forschungszentrum f{\"u}r K{\"u}nstliche Intelligenz GmbH\\Erwin-Schr{\"o}dinger Strasse\\Postfach 2080\\67608 Kaiserslautern\\Germany},
  pages		= {57},
  year		= {1995},
  URL		= {http://citeseer.nj.nec.com/donini91complexity.html},
  urlpage	= {http://citeseer.nj.nec.com/donini91complexity.html}
}