@InCollection {pilba.ACDS09,
    author = {C.A. Ardagna and M. Cremonini and S. {De Capitani di Vimercati} and P. Samarati},
    editor = {C. Bettini and S. Jajodia and P. Samarati and S. Wang},
    booktitle = {Privacy in Location Based Applications},
    title = {Access Control in Location-Based Services},
    publisher = {Springer},
    pages = {106--126},
    year = {2009}
}