title: supporting top-k join queries in relational databases. authors: walid g. aref , ahmed k. elmagarmid , ihab f. ilyas. venue: vldb. year: 2003
title: top-k selection queries over relational databases : mapping strategies and performance evaluation. authors: nicolas bruno , surajit chaudhuri , luis gravano. venue: acm transactions on database systems ( tods ). year: 2002