Please consider referencing the following conference paper in addition to the journal paper.

@InProceedings{anonysense-system,
 author = {Cory Cornelius and Apu Kapadia and David Kotz and Dan Peebles and Minho Shin and Nikos Triandopoulos},
 title = "{{AnonySense}: Privacy-Aware People-Centric Sensing}",
 booktitle = {Proceedings of the 2008 International Conference on Mobile Systems, Applications, and Services (MobiSys)},
 year = {2008},
 month = jun,
 pages = {211--224},
 doi = {10.1145/1378600.1378624},
 publisher = {ACM Press},
 copyright = {ACM}
}

@Article{anonysense-journal,
 author =       {Minho Shin and Cory Cornelius and Dan Peebles and
                 Apu Kapadia and David Kotz and Nikos Triandopoulos},
 title =        {{AnonySense}: A System for Anonymous Opportunistic
                 Sensing},
 journal =      {Journal of Pervasive and Mobile Computing},
 year =         2011,
 month =        feb,
 volume =       7,
 number =       1,
 pages =        "16--30",
 publisher =    {Elsevier},
 copyright =    {Elsevier},
 doi =          {10.1016/j.pmcj.2010.04.001}
}