Mauricio Marín Veronica Gil Costa Roberto Uribe Hybrid Index for Metric Space Databases. 327-336 2008 ICCS (1) http://dx.doi.org/10.1007/978-3-540-69384-0_38 conf/iccS/2008-1 db/conf/iccS/iccS2008-1.html#MarinCU08