Katsuhide Fujita Takayuki Ito Mark Klein A Secure and Fair Negotiation Protocol in Highly Complex Utility Space Based on Cone-Constraints. 427-430 2009 IAT http://dx.doi.org/10.1109/WI-IAT.2009.189 conf/iat/2009 db/conf/iat/iat2009.html#FujitaIK09