Einat Amitay Nadav Har'El Ron Sivan Aya Soffer Web-a-where: geotagging web content. 273-280 2004 conf/sigir/2004 SIGIR http://doi.acm.org/10.1145/1008992.1009040 db/conf/sigir/sigir2004.html#AmitayHSS04