A. van der Linde, P. Fouto, J. Leitão, N. Preguica, S. Casti\ neira, and A. Bieniusa. Proceedings of the 26th International Conference on World Wide Web, page 283--292. Republic and Canton of Geneva, Switzerland, International World Wide Web Conferences Steering Committee, (2017)
I. Clarke, O. Sandberg, B. Wiley, and T. Hong. INTERNATIONAL WORKSHOP ON DESIGNING PRIVACY ENHANCING TECHNOLOGIES: DESIGN ISSUES IN ANONYMITY AND UNOBSERVABILITY, page 46--66. Springer-Verlag New York, Inc., (2001)