title: improved histograms for selectivity estimation of range predicates. authors: v poosala , y ioannidis , p haas , e shekita. venue: sigmod conference. year: 1996.0
title: an on-line self-tuning markov histogram for xml path selectivity estimation. authors: l lim , m wang , s padamanabhan , js vitter , rxpl. venue: proceedings of. year: nan