title: minimal probing : supporting expensive predicates for top-k queries sigmod conference. authors: kevin chen-chuan chang , seung-won hwang. venue: nan. year: 2002.0
title: optimizing disjunctive queries with expensive predicates a. kemper , g. moerkotte , k. peithner , m. steinbrunn. authors: nan. venue: international conference on management of data. year: 1994.0