@inproceedings{DBLP:conf/sacmat/AoM04,
  author    = {Xuhui Ao and
               Naftaly H. Minsky},
  title     = {On the role of roles: from role-based to role-sensitive
               access control},
  booktitle = {SACMAT},
  year      = {2004},
  pages     = {51-60},
  ee        = {http://doi.acm.org/10.1145/990036.990044},
  crossref  = {DBLP:conf/sacmat/2004},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

@proceedings{DBLP:conf/sacmat/2004,
  editor    = {Trent Jaeger and
               Elena Ferrari},
  title     = {SACMAT 2004, 9th ACM Symposium on Access Control Models
               and Technologies, Yorktown Heights, New York, USA, June
               2-4, 2004, Proceedings},
  booktitle = {SACMAT},
  publisher = {ACM},
  year      = {2004},
  isbn      = {1-58113-872-5},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}