@InProceedings {bbfs.iss96,
    author = {E. Bertino and C. Bettini and E. Ferrari and P. Samarati},
    editor = {S.K. Katsikas and D. Gritzalis},
    booktitle = {Information Systems Security - Facing the Information Society of the 21st Century},
    title = {A Decentralized Temporal Authorization Model},
    publisher = {Chapman & Hall},
    pages = {271-280},
    year = {1996}
}