Martin Wirsing Grit Denker Carolyn L. Talcott Andy Poggio Linda Briesemeister A Rewriting Logic Framework for Soft Constraints. 181-197 2007 176 Electr. Notes Theor. Comput. Sci. 4 http://dx.doi.org/10.1016/j.entcs.2007.06.015 db/journals/entcs/entcs176.html#WirsingDTPB07