Nicola Policella Amedeo Cesta Angelo Oddi Stephen F. Smith From precedence constraint posting to partial order schedules: A CSP approach to Robust Scheduling. 163-180 2007 20 AI Commun. 3 http://iospress.metapress.com/openurl.asp?genre=article&issn=0921-7126&volume=20&issue=3&spage=163 db/journals/aicom/aicom20.html#PolicellaCOS07