Kar Way Tan Yimin Lin Kyriakos Mouratidis Spatial Cloaking Revisited: Distinguishing Information Leakage from Anonymity. 117-134 2009 SSTD http://dx.doi.org/10.1007/978-3-642-02982-0_10 conf/ssd/2009 db/conf/ssd/sstd2009.html#TanLM09