Rabeeh Abbasi Sergey Chernov Wolfgang Nejdl Raluca Paiu Steffen Staab Exploiting Flickr Tags and Groups for Finding Landmark Photos. 654-661 2009 ECIR http://dx.doi.org/10.1007/978-3-642-00958-7_62 conf/ecir/2009 db/conf/ecir/ecir2009.html#AbbasiCNPS09