@InProceedings {bbs.ccs94,
author = {E. Bertino and C. Bettini and P. Samarati},
booktitle = {Proc. of the 2nd ACM Conference on Computer and Communications Security},
title = {A Temporal Authorization Model},
address = {Fairfax, VA},
pages = {126-135},
month = {Novemver},
year = {1994}
}