Orkut Buyukkokten Junghoo Cho Hector Garcia-Molina Luis Gravano Narayanan Shivakumar Exploiting Geographical Location Information of Web Pages. 91-96 1999 WebDB (Informal Proceedings) http://www-rocq.inria.fr/~cluet/WEBDB/gravano.ps db/conf/webdb/webdb1999.html#BuyukkoktenCGGS99