Reference for “CSS3 Values and Units”

@TechReport{Lie:06:CVU,
  author      = "H\aa{}kon Wium Lie and Chris Lilley",
  title       = "{CSS3} Values and Units",
  month       = sep,
  note        = "http://www.w3.org/TR/2006/WD-css3-values-20060919",
  year        = "2006",
  bibsource   = "http://w2.syronex.com/jmr/w3c-biblio",
  type        = "{W3C} Working Draft",
  institution = "W3C",
}