title: selectivity estimation in spatial databases viswanath poosala , sridhar ramaswamy , swarup acharya sigmod conference 1999. authors: nan. venue: nan. year: nan
title: closest pair queries in spatial databases 2000. authors: antonio corral , yannis manolopoulos , yannis theodoridis , michael vassilakopoulos. venue: international conference on management of data. year: nan