title: wavelet-based histograms for selectivity estimation. authors: jeffrey scott vitter , yossi matias , min wang. venue: sigmod conference. year: 1998
title: one-dimensional and multi-dimensional substring selectivity estimation. authors: h. v. jagadish , olga kapitskaia , raymond t. ng , divesh srivastava. venue: the vldb journal -- the international journal on very large data bases. year: 2000