Reference for “Common Markup for micropayment per-fee-links”

@TechReport{Michel:99:CM,
  author      = "Thierry Michel",
  title       = "Common Markup for micropayment per-fee-links",
  month       = aug,
  note        = "http://www.w3.org/TR/1999/WD-Micropayment-Markup-19990825",
  year        = "1999",
  bibsource   = "http://w2.syronex.com/jmr/w3c-biblio",
  type        = "{W3C} Working Draft",
  institution = "W3C",
}