Reference for “XHTML™ Document Profile Requirements”

@TechReport{Stark:99:XDP,
  author      = "Peter Stark and Ted Wugofski and David Raggett",
  title       = "{XHTML}\texttrademark{} Document Profile Requirements",
  month       = sep,
  note        = "http://www.w3.org/TR/1999/WD-xhtml-prof-req-19990906",
  year        = "1999",
  bibsource   = "http://w2.syronex.com/jmr/w3c-biblio",
  type        = "{W3C} Working Draft",
  institution = "W3C",
}