Y. Hu. Proceedings of the Workshop on Privacy Enforcement and Accountability with Semantics (PEAS2007) at ISWC/ASWC2007, Busan, South Korea, (November 2007)
V. Atluri, and J. Warner. SACMAT '05: Proceedings of the tenth ACM symposium on Access control models and technologies, page 49--58. New York, NY, USA, ACM Press, (2005)