Maozhen Li Bin Yu Chang Huang Yong-Hua Song Service Matchmaking with Rough Sets. 123-130 2006 conf/ccgrid/2006 CCGRID http://doi.ieeecomputersociety.org/10.1109/CCGRID.2006.91 db/conf/ccgrid/ccgrid2006.html#LiYHS06