Kothuri Venkata Ravi Kanth Siva Ravada W. Xu Spatial Processing using Oracle Table Functions. 851-856 http://csdl.computer.org/comp/proceedings/icde/2003/2071/00/20710851abs.htm 2003 conf/icde/2003 ICDE db/conf/icde/icde2003.html#KanthRX03