E. de Maat, R. Winkels, and T. van Engers. Proceedings of the 2006 Conference on Legal Knowledge and Information Systems: JURIX 2006: The Nineteenth Annual Conference, page 41--50. Amsterdam, The Netherlands, The Netherlands, IOS Press, (2006)
M. Palmirani, R. Brighi, and M. Massini. Proceedings of the 9th International Conference on Artificial Intelligence and Law, page 105--106. New York, NY, USA, ACM, (2003)