title: histogram-based approximation of set-valued query-answers viswanath poosala , yannis e. ioannidis. authors: nan. venue: vldb. year: 1999.0
title: histogram-based approximation of set-valued query-answers very large data bases. authors: yannis e. ioannidis , viswanath poosala. venue: nan. year: 1999.0