@techreport{vanHarmelen-etal2001-daml,
  author	= {van Harmelen, Frank and Patel-Schneider, Peter F. and Horrocks, Ian},
  title		= {Reference Description of the DAML+OIL (March 2001) ontology markup language},
  institution	= {W3C},
  year		= {2001},
  URL		= {http://www.daml.org/2001/03/reference.html},
  urlpage	= {http://www.daml.org/2001/03/reference.html},
  month		= mar
}