title: approximating aggregate queries about web pages via random walks vldb 2000. authors: jittat fakcharoenphol , steve chien , ziv bar-yossef , alexander berg , dror weitz. venue: nan. year: nan
title: a robust , optimization-based approach for approximate answering of aggregate queries 2001. authors: surajit chaudhuri , gautam das , vivek narasayya. venue: international conference on management of data. year: nan