Mario A. Nascimento Veena Sridhar Xiaobo Li Effective and efficient region-based image retrieval. 151-179 2003 14 J. Vis. Lang. Comput. 2 http://dx.doi.org/10.1016/S1045-926X(02)00076-9 db/journals/vlc/vlc14.html#NascimentoSL03