Gwyduk Yeom Wei-Tek Tsai Xiaoying Bai Dugki Min Design of a Contract-Based Web Services QoS Management System. 306-311 2009 ICDCS Workshops http://dx.doi.org/10.1109/ICDCSW.2009.74 conf/icdcsw/2009 db/conf/icdcsw/icdcsw2009.html#YeomTBM09