Haiwei Ye Brigitte Kerhervé Gregor von Bochmann Vincent Oria Pushing Quality of Service Information and Requirements into Global Query Optimization. 170-179 2003 conf/ideas/2003 IDEAS http://csdl.computer.org/comp/proceedings/ideas/2003/1981/00/19810170abs.htm db/conf/ideas/ideas2003.html#YeKBO03