Allel HadjAli Souhila Kaci Henri Prade Database Preferences Queries - A Possibilistic Logic Approach with Symbolic Priorities. 291-310 2008 conf/foiks/2008 FoIKS http://dx.doi.org/10.1007/978-3-540-77684-0_20 db/conf/foiks/foiks2008.html#HadjAliKP08