Iman Jarkass Michèle Rombaut Dealing with uncertainty on the initial state of a Petri net. 289-295 1998 conf/uai/1998 UAI http://rome.exp.sis.pitt.edu/UAI/Abstract.asp?articleID=259&proceedingID=14 db/conf/uai/uai1998.html#JarkassR98