Silja Renooij Linda C. van der Gaag Simon Parsons Shaw Green Pivotal Pruning of Trade-offs in QPNs. 515-522 2000 conf/uai/2000 UAI http://rome.exp.sis.pitt.edu/UAI/Abstract.asp?articleID=60&proceedingID=16 db/conf/uai/uai2000.html#RenooijGPG00