@Article {ddps.tissec,
author = {E. Damiani and S. {De Capitani di Vimercati} and S. Paraboschi and P. Samarati},
title = {A Fine-Grained Access Control System for {XML} Documents},
journal = {ACM Transactions on Information and System Security (TISSEC)},
volume = {5},
number = {2},
month = {May},
year = {2002}
}