Reference for “Time Ontology in OWL”

@TechReport{Pan:06:TOO,
  author      = "Feng Pan and Jerry R. Hobbs",
  title       = "Time Ontology in {OWL}",
  month       = sep,
  note        = "http://www.w3.org/TR/2006/WD-owl-time-20060927/",
  year        = "2006",
  bibsource   = "http://w2.syronex.com/jmr/w3c-biblio",
  type        = "{W3C} Working Draft",
  institution = "W3C",
}