@InProceedings {jss.oak97,
author = {S. Jajodia and P. Samarati and {V.S.} Subramanian},
booktitle = {Proc. of the 1997 IEEE Symposium on Security and Privacy},
title = {A Logical Language for Expressing Authorizations},
address = {Oakland, CA},
month = {May},
year = {1997}
}