@Article {ddls.jcss01,
    author = {S. Dawson and S. {De Capitani di Vimercati} and P. Lincoln and P. Samarati},
    title = {Maximizing Sharing of Protected Information},
    journal = {Journal of Computer and System Sciences (JCSS)},
    volume = {64},
    number = {3},
    pages = {496-541},
    month = {May},
    year = {2002}
}