Allel HadjAli Olivier Pivert Towards Fuzzy Query Answering Using Fuzzy Views - A Graded-Subsumption-Based Approach. 268-277 2008 ISMIS http://dx.doi.org/10.1007/978-3-540-68123-6_30 conf/ismis/2008 db/conf/ismis/ismis2008.html#HadjAliP08