H. Yoshino, S. Kagayama, S. Ohta, M. Kitahara, H. Kondoh, M. Nakakawaji, K. Ishimaru, S. Takao. Legal Expert System LES-2. In Eiiti Wada, editor, Logic Programming 86, Proceedings of the 5th Conference, Tokyo, Japan, June 23-26, 1986. Volume 264 of Lecture Notes in Computer Science, pages 34-45, Springer, 1986.