Baik Hoh Marco Gruteser Hui Xiong Ansaf Alrabady Preserving privacy in gps traces via uncertainty-aware path cloaking. 161-171 2007 ACM Conference on Computer and Communications Security http://doi.acm.org/10.1145/1315245.1315266 conf/ccs/2007 db/conf/ccs/ccs2007.html#HohGXA07