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@Book{ Bertino, title = "A Policy-Based Authorization Framework for Web Services: Integrating X-GTRBAC and WS-Policy", author = "Elisa Bertino, Rafae Bhatti, Daniel Sanz, Arif Ghafoor", booktitle = "Securing Web Services: Practical Usage of Standards and Specifications", url = "http://books.google.com/books?hl=en&lr=&id=zX2N7fWTJOUC&oi=fnd&pg=PA138&dq=Purdue+University+Bertino&ots=iNRkJ3DcRf&sig=fz14LY3ax7q-ErNObnjUb8gVaY0", }