title: estimating the selectivity of spatial queries using the ` correlation ' fractal dimension. authors: christos faloutsos , alberto belussi. venue: vldb. year: 1995
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