@InProceedings{A_Policy_Based_Approach_to_Security_for_the_Semantic_Web, author = "Lalana Kagal, Tim Finin, and Anupam Joshi", title = "{A Policy Based Approach to Security for the Semantic Web}", month = "September", year = "2003", pages = "402-418", booktitle = "2nd International Semantic Web Conference (ISWC2003)", publisher = "Springer", }