Reference for “Cascading Style Sheets Level 2 Revision 1 (CSS 2.1) Specification”

@TechReport{9135452,
  author      = "Tantek \c{C}elik and Bert Bos and Ian Hickson and H\aa{}kon Wium Lie",
  title       = "Cascading Style Sheets Level 2 Revision 1 ({CSS} 2.1) Specification",
  month       = sep,
  note        = "http://www.w3.org/TR/2009/CR-CSS2-20090908",
  year        = "2009",
  bibsource   = "http://w2.syronex.com/jmr/w3c-biblio",
  type        = "Candidate Recommendation",
  institution = "W3C",
}