Alan Eckhardt Tomás Horváth Peter Vojtás Learning Different User Profile Annotated Rules for Fuzzy Preference Top-k Querying. 116-130 2007 conf/sum/2007 SUM http://dx.doi.org/10.1007/978-3-540-75410-7_9 db/conf/sum/sum2007.html#EckhardtHV07