Jaume Amores Nicu Sebe Petia Radeva Theo Gevers Arnold W. M. Smeulders Boosting contextual information in content-based image retrieval. 31-38 2004 conf/mir/2004 Multimedia Information Retrieval http://doi.acm.org/10.1145/1026711.1026717 db/conf/mir/mir2004.html#AmoresSRGS04