Reference for “Selectors Level 3”

@TechReport{Williams:09:SL,
  author      = "John Williams and Peter Linss and Elika J. Etemad and Daniel Glazman and Ian Hickson and Tantek \c{C}elik",
  title       = "Selectors Level 3",
  month       = mar,
  note        = "http://www.w3.org/TR/2009/WD-css3-selectors-20090310",
  year        = "2009",
  bibsource   = "http://w2.syronex.com/jmr/w3c-biblio",
  type        = "Last Call {WD}",
  institution = "W3C",
}