Reference for “WS Choreography Model Overview”

@TechReport{Kavantzas:04:WCM,
  author      = "Nickolas Kavantzas and David Burdett",
  title       = "{WS} Choreography Model Overview",
  month       = mar,
  note        = "http://www.w3.org/TR/2004/WD-ws-chor-model-20040324/",
  year        = "2004",
  bibsource   = "http://w2.syronex.com/jmr/w3c-biblio",
  type        = "{W3C} Working Draft",
  institution = "W3C",
}