Manghui Tu Peng Li Liangliang Xiao I-Ling Yen Farokh B. Bastani Replica Placement Algorithms for Mobile Transaction Systems. 954-970 2006 18 IEEE Trans. Knowl. Data Eng. 7 http://doi.ieeecomputersociety.org/10.1109/TKDE.2006.114 db/journals/tkde/tkde18.html#TuLXYB06