Antonio Corral Alejandro D'Ermiliis Yannis Manolopoulos Michael Vassilakopoulos VA-Files vs. R*-Trees in Distance Join Queries. 153-166 2005 conf/adbis/2005 ADBIS http://dx.doi.org/10.1007/11547686_12 db/conf/adbis/adbis2005.html#CorralDMV05