@InProceedings{kapadia:walls,
    author = {Apu Kapadia and Tristan Henderson and Jeffrey J. Fielding and David Kotz},
    title = "{Virtual Walls: Protecting Digital Privacy in Pervasive Environments}",
    booktitle = {Proceedings of the Fifth International Conference on Pervasive Computing (Pervasive)},
    year = {2007},
    month = may,
    pages = {162--179},
    series = {LNCS},
    volume = {4480},
    doi = {10.1007/978-3-540-72037-9_10},
    publisher = {Springer-Verlag},
    copyright = {Springer-Verlag}
}