title: a comparison of selectivity estimators for range queries on metric attributes. authors: bernhard seeger , björn blohsfeld , dieter korus. venue: sigmod conference. year: 1999
title: improved histograms for selectivity estimation of range predicates. authors: viswanath poosala , peter j. haas , yannis e. ioannidis , eugene j. shekita. venue: international conference on management of data. year: 1996