@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}
}