@article{DBLP:journals/cacm/Graham68,
author = {Robert M. Graham},
title = {Protection in an information processing utility},
journal = {Commun. ACM},
volume = {11},
number = {5},
year = {1968},
pages = {365-369},
ee = {http://doi.acm.org/10.1145/363095.363146},
bibsource = {DBLP, http://dblp.uni-trier.de}
}