@Article {ad.csse,
author = {{C.A.} Ardagna and S. {De Capitani di Vimercati}},
title = {A Comparison of Modeling Strategies in Defining XML-Based Access Control Language},
journal = {Computer Systems Science & Engineering Journal},
volume = {19},
number = {3},
pages = {141--149},
month = {May},
year = {2004}
}