Akihiko Nakagawa Andrea Kutics Kiyotaka Tanaka Masaomi Nakajima Combining words and object-based visual features in image retrieval. 354-359 http://csdl.computer.org/comp/proceedings/iciap/2003/1948/00/19480354abs.htm 2003 conf/iciap/2003 ICIAP db/conf/iciap/iciap2003.html#NakagawaKTN03