Charles Castel Corine Cossart Catherine Tessier Dealing with Uncertainty in Situation Assessment: towards a Symbolic Approach. 61-68 1998 conf/uai/1998 UAI http://rome.exp.sis.pitt.edu/UAI/Abstract.asp?articleID=233&proceedingID=14 db/conf/uai/uai1998.html#CastelCT98