title: prefer : a system for the efficient execution of multi-parametric ranked queries. authors: yannis papakonstantinou , vagelis hristidis , nick koudas. venue: sigmod conference. year: 2001
title: prefer : a system for the efficient execution of multi-parametric ranked queries. authors: vagelis hristidis , nick koudas , yannis papakonstantinou. venue: international conference on management of data. year: 2001