Reference for “Grammar Representation Requirements for Voice Markup Languages”

@TechReport{Brown:99:GRR,
  author      = "Michael K. Brown",
  title       = "Grammar Representation Requirements for Voice Markup Languages",
  month       = dec,
  note        = "http://www.w3.org/TR/1999/WD-voice-grammar-reqs-19991223",
  year        = "1999",
  bibsource   = "http://w2.syronex.com/jmr/w3c-biblio",
  type        = "{W3C} Working Draft",
  institution = "W3C",
}