Yi-Cheng Tu Jingfeng Yan Gang Shen Sunil Prabhakar Multiquality Data Replication in Multimedia Databases. 679-694 2007 19 IEEE Trans. Knowl. Data Eng. 5 http://dx.doi.org/10.1109/TKDE.2007.1013 db/journals/tkde/tkde19.html#TuYSP07