Stan Y. Liao Narendra V. Shenoy William Nicholls An Efficient External-Memory Implementation of Region Query with Application to Area Routing. 36-41 2002 conf/iccd/2002 ICCD http://doi.ieeecomputersociety.org/10.1109/ICCD.2002.1106744 db/conf/iccd/iccd2002.html#LiaoSN02