Apu Kapadia Nikos Triandopoulos Cory Cornelius Daniel Peebles David Kotz AnonySense: Opportunistic and Privacy-Preserving Context Collection. 280-297 2008 Pervasive http://dx.doi.org/10.1007/978-3-540-79576-6_17 conf/pervasive/2008 db/conf/pervasive/pervasive2008.html#KapadiaTCPK08