Chien-Min Wang Chun-Chen Hsu Pangfeng Liu Hsi-Min Chen Jan-Jan Wu Optimizing Server Placement in Hierarchical Grid Environments. 1-11 2006 conf/gpc/2006 GPC http://dx.doi.org/10.1007/11745693_1 db/conf/gpc/gpc2006.html#WangHLCW06