Ta Nguyen Binh Duong Suiping Zhou Server Placement for Enhancing the Interactivity of Large-Scale Distributed Virtual Environments. 123-132 2006 conf/cw/2006 CW http://doi.ieeecomputersociety.org/10.1109/CW.2006.34 db/conf/cw/cw2006.html#TaZ06