Q. Ni, S. Xu, E. Bertino, R. Sandhu, and W. Han. Secure Data Management, volume 5776 of Lecture Notes in Computer Science, page 68-88. Springer, (2009)
E. Bertino, E. Ferrari, and A. Squicciarini. Privacy Enhancing Technologies, volume 3424 of Lecture Notes in Computer Science, page 283-301. Springer, (2004)