Reference for “OWL Web Ontology Language Semantics and Abstract Syntax”

@TechReport{Hayes:04:OWO,
  author      = "Patrick Hayes and Peter F. Patel-Schneider and Ian Horrocks",
  title       = "{OWL} Web Ontology Language Semantics and Abstract Syntax",
  month       = feb,
  note        = "http://www.w3.org/TR/2004/REC-owl-semantics-20040210/",
  year        = "2004",
  bibsource   = "http://w2.syronex.com/jmr/w3c-biblio",
  type        = "{W3C} Recommendation",
  institution = "W3C",
}