Andreas Schmid Srinivas Padmanabhuni Andreas Schroeder A Soft Constraints-Based Approach for Reconciliation of Non-Functional Requirements in Web Services-Based Multi-Agent Systems. 711-718 2007 conf/icws/2007 ICWS http://doi.ieeecomputersociety.org/10.1109/ICWS.2007.24 db/conf/icws/icws2007.html#SchmidPS07