David Burdett; Nickolas Kavantzas. <a href="http://www.w3.org/TR/2004/WD-ws-chor-model-20040324"><cite>WS Choreography Model Overview.</cite></a> 24 March 2004. W3C Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/2004/WD-ws-chor-model-20040324">http://www.w3.org/TR/2004/WD-ws-chor-model-20040324</a>