Reference for “Ruby Annotation”

@TechReport{5647346,
  author      = "Martin D{\"{u}}rst and Michel Suignard and Marcin Sawicki and Masayasu Ishikawa and Tex Texin",
  title       = "Ruby Annotation",
  month       = may,
  note        = "http://www.w3.org/TR/2001/REC-ruby-20010531",
  year        = "2001",
  bibsource   = "http://w2.syronex.com/jmr/w3c-biblio",
  type        = "{W3C} Recommendation",
  institution = "W3C",
}