Kazumasa Yokota and Hideki Yasukawa, ``Towards an Integrated Knowledge-Base Management System --- Overview of R\&D on Databases and Knowledge-Bases in the FGCS Project'', Proc. Int. Conf. on Fifth Generation Computer Systems (FGCS'92), Tokyo, June 1-5, 1992. 横田一正, ``演繹オブジェクト指向データベース Quixote の法的推論への応用'', 人工知能学会誌, vol.10, no.1, 1995. Chie Takahashi and Kazumasa Yokota, ``Constructing a Legal Database on Quixote'', Proc. the Sixth Australasian Database Conference (ADC'95), Adelaide, Australia, Jan. 30,31, 1995.