@InProceedings {bs.nspw95,
    author = {E. Bertino and P. Samarati},
    booktitle = {Proc. of the 1995 ACM SIGSAC New Security Paradigms Workshop},
    title = {Research Issues in Authorization Models for Hypertext Systems},
    address = {La Jolla, CA},
    pages = {22-27},
    month = {August},
    year = {1995}
}