title: factorizing complex predicates in queries to exploit indexes. authors: prasanna ganesan , sunita sarawagi , surajit chaudhuri. venue: sigmod conference. year: 2003
title: optimizing disjunctive queries with expensive predicates. authors: a. kemper , g. moerkotte , k. peithner , m. steinbrunn. venue: international conference on management of data. year: 1994