Salem Benferhat Karima Sedki A Revised Qualitative Choice Logic for Handling Prioritized Preferences. 635-647 2007 conf/ecsqaru/2007 ECSQARU http://dx.doi.org/10.1007/978-3-540-75256-1_56 db/conf/ecsqaru/ecsqaru2007.html#BenferhatS07