title: xpathlearner : an on-line self-tuning markov histogram for xml path selectivity estimation vldb 2002. authors: lipyeow lim , ronald parr , jeffrey scott vitter , sriram padmanabhan , min wang. venue: nan. year: nan
title: improved histograms for selectivity estimation of range predicates viswanath poosala , peter j. haas , yannis e. ioannidis , eugene j. shekita international conference on management of data 1996. authors: nan. venue: nan. year: nan