Li Liu Wentong Cai Stephen John Turner Guangya Li Improving Data Filtering Accuracy in Hierarchical Federations. 209-215 2003 conf/anss/2003 Annual Simulation Symposium http://doi.ieeecomputersociety.org/10.1109/SIMSYM.2003.1192815 db/conf/anss/anss2003.html#LiuCTL03