Feng Zhu Wei Zhu RationalExposure: a Game Theoretic Approach to Optimize Identity Exposure in Pervasive Computing Environments. 1-8 2009 PerCom http://dx.doi.org/10.1109/PERCOM.2009.4912755 conf/percom/2009 db/conf/percom/percom2009.html#ZhuZ09