db/conf/gis/PapadopoulosM96.html Apostolos Papadopoulos Yannis Manolopoulos Parallel Processing of Nearest Neighbor Queries in Declustered Spatial Data. 35-43 GIS1996/P035.pdf 1996 conf/gis/96 ACM-GIS http://doi.acm.org/10.1145/258319.258330 db/conf/gis/gis96.html#PapadopoulosM96